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the sum of two numbers is 51 l, their difference is 21 l, find the smaller number
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SANDMAN18IN

let x is higher number

let y is smaller number

x + y = 51 eq. 1

x - y = 21 eq. 2

find y:

solve for x using eq. 2

x = 21 + y

substitute the value of x to eq. 1

(21 + y) + y = 51

21 + 2y = 51

2y = 51 - 21

2y = 30

y = 30/2

y = 15 ------answer

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