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Question

What number must be added to each of the numbers 10,18,22,38 to make them in proportion?


A

2

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B

4

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C

8

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D

6

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Solution

The correct option is C (2)

Given numbers: 10,18,22,38
Let the number be x.
10+x:18+x=22+x:38+x
(10+x)(38+x)=(18+x)(22+x)
380+10x+38x+x2=396+18x+22x+x2
48x40x=396380
8x=16
x=2


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