Math Is Fun Forum

  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

You are not logged in.

#1 2007-10-22 18:38:04

soha
Real Member
Registered: 2006-07-07
Posts: 2,530

what number?

A)A number added to its  two thirds is equal to 35.Find the number.
B)The sum of two numbers is 50 , their diffrence is 10 .Find the numbers.

thanks:)


"Let us realize that: the privilege to work is a gift, the power to work is a blessing, the love of work is success!" smile smile
- David O. McKay

Offline

#2 2007-10-22 20:26:32

Khushboo
Member
Registered: 2007-10-16
Posts: 47

Re: what number?

Let the no. be x
=>x+2/3x=35
=>5x/3=35
or x=21

b) let the no. be x,y
=> x+y=50......1)
=>x-y=10.........2)
you can simultaneously solve and cancel y
=> 2x=60
or x=30
similarly solve for y, cancel out x by putting minus sign beneath both the equations.
=>2y=40
or y=20

this should help

khushboo

Last edited by Khushboo (2007-10-22 23:03:20)

Offline

#3 2007-10-22 22:23:57

JaneFairfax
Member
Registered: 2007-02-23
Posts: 6,868

Re: what number?

Khushboo wrote:

Let the no. be x
=>x+2/3x=35
=>5x/3=35
or x=21

Offline

#4 2007-10-22 23:01:50

Khushboo
Member
Registered: 2007-10-16
Posts: 47

Re: what number?

oops i am sorry

Jane is correct
it should be

=>x+2/3x=35
=>5x/3=35
or x=21

and not  14

Thanxs

Offline

#5 2007-10-24 17:38:07

landof+
Member
Registered: 2007-03-24
Posts: 131

Re: what number?

simplified in my language:

a)35 is (5/3) or 1 2/3 times of the number. Find 1 times the number.
b)the smaller number is 1/2(50-10). Just add 10 to that result and you have the greater number.

Last edited by landof+ (2007-10-24 17:38:53)


I shall be on leave until I say so...

Offline

#6 2007-10-24 19:49:15

soha
Real Member
Registered: 2006-07-07
Posts: 2,530

Re: what number?

Khushboo wrote:

oops i am sorry

Jane is correct
it should be

=>x+2/3x=35
=>5x/3=35
or x=21

and not  14

Thanxs

i see 21 there, not 14


"Let us realize that: the privilege to work is a gift, the power to work is a blessing, the love of work is success!" smile smile
- David O. McKay

Offline

#7 2007-10-24 22:50:20

ganesh
Administrator
Registered: 2005-06-28
Posts: 35,503

Re: what number?

soha,
The post has been edited by Khushboo. She has replaced 14 by 21 in  post#2.  smilewave cool


It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

Board footer

Powered by FluxBB