Question

A positive number is 5 times another number . if 21 is added to both the numbers then one of the new number becomes twice the other new number .what are the numbers?

Answer 1

let the positive no be X
then 5x+21=2x
5x-2x=21
3x =21
x=21/3
x=7
one no is 7and the other no 7+7=17

Answer 2

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A positive number is 5 times another number. If 21 is added to both the numbers, then one of the new numbers becomes twice the other new number. What are the numbers?

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Let above number be 'x'

$\leadsto \tt{2 \times x + 21 = 5x + 21}$

$\leadsto \tt{2 x + 42 = 5x + 21}$

$\leadsto \tt{2 x - 5x = 21 - 42}$

$\leadsto \tt{- 3x = 21 }$

$\leadsto \tt{ 3x = 21 }$

$\leadsto \tt{ x = \frac{21}{3} }$

$\leadsto \tt{ x = 7}$

So the two numbers are 7 and 35.

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