Question

Find x in each of the following:
(d) 21:12::x:8
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Answer 1

Answer:

21:12::x:8

7:4::x:8

multiplying lhs by 2

14:8::x:8

so x=14 answer

Answer 2

Answer:

x= 31.5

$\frac{21}{12} = \frac{x}{8} \\ \frac{21 \times 8}{12} = x \\ x = 14$