10 second questions

Jai Ganesh · 2012-05-21 23:08:10

Hi bobbym,

The solutions #4080 and #4081 are correct. Excellent!

#4082. If the speed of a train is 93.6 kilometers per hour, how many meters would it cover in 10 minutes?

#4083. Wilfred can cover a distance in 1 hour 24 minutes by covering 2/3 rd of the distance at 4 kilometers per hour and the rest at 5 kilometers per hour. What is the total distance?

bobbym · 2012-05-22 00:40:24

Hi;

Jai Ganesh · 2012-05-22 23:14:34

Hi bobbym,

The solutions #4082 and #4083 are correct. Brilliant!

#4084. Find the time taken by a train 150 meters long, running at 54 kilometers per hour in crossing an electric pole.

#4085. A train 150 meters long is running at 72 kilometers per hour. In what time would it pass a platform 250 meters long?

bobbym · 2012-05-22 23:46:32

Hi;

Jai Ganesh · 2012-05-23 23:01:14

Hi bobbym,

The solutions #4084 and #4085 are correct. Marvelous!

#4086. A man standing on a railway bridge which is 150 meters long finds that the train crosses the bridge in 19 seconds but himself in 9 seconds. Find the length of the train and its speed.

#4087. How many seconds would a 225 meters long train traveling at 45 kilometers per hour take to cross a pole?

bobbym · 2012-05-23 23:08:35

Hi;

Jai Ganesh · 2012-05-25 00:20:35

Hi bobbym,

The solutions #4086 and #4087 are correct. Outstanding!

#4088. By selling 15 pencils for $30, Rahim lost 20%. How many should he sell for $52 to have a gain of 30%?

#4089. By selling a book for $200, Christopher lost 10%. By what price should he sell to gain 10%?

bobbym · 2012-05-25 00:33:04

Hi ganesh;

Jai Ganesh · 2012-05-26 23:59:42

Hi bobbym,

The solution #4089

#4090. Jack sold a horse at 6% loss. There would have been a gain of 4% if he had sold it for $50 more. Find the cost price of the horse.

bobbym · 2012-05-27 00:07:51

Hi ganesh;

Jai Ganesh · 2012-05-27 23:33:13

Hi bobbym,

The solution #4090 is correct. Excellent!

#4091. The monthly salary of a person gets increased by 5% thereby becoming $15,120 per annum. What was his earlier salary per month?

#4092. If 280 is divided into two parts such that when 15% of the first part is added to 25% of the other yields 54. What would be the difference in two parts?

bobbym · 2012-05-27 23:56:43

Hi ganesh;

Jai Ganesh · 2012-05-28 23:49:25

Hi bobbym,

The solutions #4091 and #4092 are correct. Brilliant!

#4093. A student first decreased a number by 20% and then increased the decreased number by 20%. The number so obtained is less than the original number. What was the original number?

#4094. A 10 liter solution of water and salt contains 150 grams salt. If 25% of solution gets evaporated, what percent of salt would be the remaining solution have?

bobbym · 2012-05-28 23:56:21

Hi;

Jai Ganesh · 2012-05-29 11:08:52

Hi bobbym,

The

The solution #4094 is correct. Good work!

#4095. If the side of an equilateral triangle is increased by 30%, how much increase will take place in its area?

bobbym · 2012-05-29 11:14:36

Hi;

Jai Ganesh · 2012-05-29 16:16:16

Hi bobbym,

The solution #4095 is correct. Brilliant!

#4096. A textile worker's wages are increased by 20% and afterwards decreased by 20%. Find the change of percentage in his wages.

#4097. Find the value of x if

140% of 450 + 5½ of 400 = x.

bobbym · 2012-05-29 16:18:21

Hi;

Jai Ganesh · 2012-05-29 22:26:21

Hi bobbym,

The solution #4096 is correct. Well done!

#4098. If the side of a square is increased by 25%, by what percent would its area increase?

bobbym · 2012-05-29 22:44:05

Hi;

Jai Ganesh · 2012-05-30 21:30:35

Hi bobbym,

The solution #4098 is correct. Well done!

#4099. In a competitive examination, 10,000 boys and 12,000 girls appeared. If 26% of the boys and 15% of the girls could qualify, what is the overall percentage of students who could not qualify the test?

#4100. At an election contested by two, the loser loses by a margin of 20% equivalent to 20,000 votes. If the polling was only 50% of the total eligible number, how many people were eligible for casting their votes?

bobbym · 2012-05-30 21:45:44

Hi;

Jai Ganesh · 2012-05-31 23:47:02

Hi bobbym,

The solutions #4099 and #4100 are correct. Brilliant!

#4101. A man's working hours per day were increased by 20% and his wages per hour were increased by 15%. By how much percent are his earnings (daily wages) increased?

#4102. A father is four times as old as his son. After 2 years, he would be twice as old. At the time of birth of his son, how much old must the father be?

bobbym · 2012-06-01 00:58:53

Hi;

Jai Ganesh · 2012-06-01 18:00:19

Hi bobbym,

The solution #4101 is correct. Good work!

The problem was a typo. Regretted! The problem should have been:

A father is four times as old as his son. After 20 years, he would be twice as old. At the time of birth of his son, how much old must the father be?

The solution is 30 years.

#4103. The average age of a class of 20 students is 20 years. If the teacher's age is included, the average increases by 1. What is the age of the teacher?

#4104. The average age of a class of 24 students is 24 years. The average increased by 1 when the teacher's age is included. What is the teacher's age?

Math Is Fun Forum

#3876 2012-05-21 23:08:10

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#3877 2012-05-22 00:40:24

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#3878 2012-05-22 23:14:34

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#3880 2012-05-23 23:01:14

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#3881 2012-05-23 23:08:35

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#3882 2012-05-25 00:20:35

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#3883 2012-05-25 00:33:04

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#3884 2012-05-26 23:59:42

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#3885 2012-05-27 00:07:51

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#3886 2012-05-27 23:33:13

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#3887 2012-05-27 23:56:43

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#3888 2012-05-28 23:49:25

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#3889 2012-05-28 23:56:21

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#3890 2012-05-29 11:08:52

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