Question

find 2 numbers such that the first added 2 to the second makes 21​

Answer 1

Let the first number is x and second is y  

Given twice of first added with second gives 21  

∴2x+y=21               ...(1)

And given twice of second added with first gives 27

∴x+2y=27               ...(2)

Multiply (1) by 2

Then 4x+2y=42       ...(3)

Subtract (3) with (2)

Then 3x=15

Or x=5

Put the value of x=5 in (1)

Then 10+y=21

Or y=21−10

Or y=11

Then first number is 5 and second is 11.

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