Question

the sum of two numbers is 35 if one number is 3/4 of the other find the smallest number

Answer 1

$x + \frac{3x}{4} = 35 \\ \frac{7x}{4} = 35 \\7 x = 140 \\ x = 20 \\ so \: smaller \: no = \frac{3 \times 20}{4} = 15$
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Answer 2

hope it's clear.........