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The sum of two numbers is 84.The first is 9 more than 4 times the second.Find the first number.

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X + y = 84
x = 4y + 9
so 4y + 9 +y = 84
5y = 75
y = 15
x = 60 + 9 = 69
Check
69 + 15 = 84

Posted on Apr 23, 2014

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SOURCE: The sum of three number is 75. The second is 5

The first is 11, the second is 16 and the third is 48, as far as I know.

Posted on Oct 12, 2009

htechie
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SOURCE: gr 8 question

The two numbers are 9 and 27.

Solution:
Suppose the two numbers are x and y, then,

x + y = 36 ---------1
and
x = 3y -------------2

Solving equation 1 and 2...

3y+y=36 => 4y=36 => y = 9
x + 9 = 36 => x = 27

Please rate and comment if my answer is right.

Posted on Feb 01, 2010

  • 146 Answers

SOURCE: The units digit of a two-digit number exceeds the

no is 24. (2+4)*4=24 ie sum of digits*4 gives the original number

Posted on Mar 31, 2010

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SOURCE: find two numbers such that the sum of the first and three times the second is 5 and the sum of the second and 2 times the first is 8

3.8 and 0.4 .

If this is homework, make sure to sure your work.

Posted on Nov 14, 2013

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1 Answer

Sum of two numbers


Say first number is x and second is y, then
x + y = 205 ( rewriting: y = 205 - x)
and
x - y = 75.
Substituting second equation into third:
x - (205-x) = 75
x - 205 + x = 75
2x - 205 = 75
2x = 75 + 205
2x = 280
x = 140
y= 205 - x (above) = 205 - 140 = 65

Dec 09, 2013 | Computers & Internet

1 Answer

Find two numbers such that the sum of the first and three times the second is 5 and the sum of the second and 2 times the first is 8


Let the two numbers be X and Y:
X + 3Y = 5
2X + Y = 8

Rewrite the second equation to Y = 8 - 2X and substitute in first equation:
X + 3(8-2X) = 5
X + 24 - 6X = 5
-5X + 24 = 5
-5X = 5 - 24
-5X = -19
X = 19/5 = 3.8
Y = 8 - 2(3.8) = 8 - 7.6 = 0.4

Check: 3.8 + 3(0.4) = 3.8 + 1.2 = 5
2(3.8) + .4 = 7.6 + 0.4 = 8

Nov 14, 2013 | Computers & Internet

1 Answer

Create javascript code whose function is to compute the sum of two inputs?


Hello,
The following code will dynamically calculate the some of the first two fields:



Enter first number:
Enter second number:
Their sum is:

Best Regards, Ben

Jun 29, 2011 | Computers & Internet

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