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If $x$ and $y$ are in inverse proportion and the table is $x$ : 4, 8, ?; $y$ : 30, 15, 10 — find the missing $x$ .

Class 8Direct and Inverse ProportionsDirect and Inverse Proportions

A24
B11
C13
D12

Step-by-Step Solution

Inverse means

x

times

y

is constant:

4 \times 30 = 120

and

8 \times 15 = 120

. For

y = 10 : x = \frac{120}{10} = 12

.

Answer: D) 12

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