Proportion 13963

Please write the number 140 as the sum of two numbers whose proportion is 3.

Correct answer:

a =  105
b =  35

Step-by-step explanation:


a+b=140
a = 3b

a+b=140
a = 3·b

a+b = 140
a-3b = 0

Row 2 - Row 1 → Row 2
a+b = 140
-4b = -140


b = -140/-4 = 35
a = 140-b = 140-35 = 105

a = 105
b = 35

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