Question

10:99::9:?in question in may

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Answer 1

Step-by-step explanation:

10 : 99 :: 9 : ?

-->a : b :: c : d

then,

a x d = b x c

product of extremes equals product of means

therefore,

$10 \times x = 99 \times 9 \\ 10x = 891 \\ x = 891 \div 10 \\ x = 89.1 \\ x = 89 \: (approx.)$

Answer 2

89 approx
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