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#1 2007-10-22 18:38:04
- soha
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- Registered: 2006-07-07
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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:)
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#2 2007-10-22 20:26:32
- Khushboo
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- Registered: 2007-10-16
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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)
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#3 2007-10-22 22:23:57
- JaneFairfax
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- Registered: 2007-02-23
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Re: what number?
Let the no. be x
=>x+2/3x=35
=>5x/3=35
or x=21
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#4 2007-10-22 23:01:50
- Khushboo
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- Registered: 2007-10-16
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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
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#5 2007-10-24 17:38:07
- landof+
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- 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)
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#6 2007-10-24 19:49:15
- soha
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- Registered: 2006-07-07
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Re: what number?
oops i am sorry
Jane is correct
it should be=>x+2/3x=35
=>5x/3=35
or x=21and 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!"
- David O. McKay
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#7 2007-10-24 22:50:20
- Jai Ganesh
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- Registered: 2005-06-28
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Re: what number?
soha,
The post has been edited by Khushboo. She has replaced 14 by 21 in post#2. 
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.
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