If 4 : 5 = 8 : 10, then 9 :5 = __________.

8 : 10

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4 : 9

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18 : 10

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18 : 5

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Solution

The correct option is C 18 : 10
According to componendo property of proportion
If a : b = c : d ,then
a + b : b = c + d : d.
Here 4 : 5 = 8 : 10 (given)
(4 + 5) : 5 = (8 + 10): 10
Hence 9 : 5 = 18 : 10

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Similar questions

If A:B = $\frac{1}{2} : \frac{3}{8}$ , B:C = $\frac{1}{3} : \frac{5}{9}$ and C:D = $\frac{5}{6} : \frac{3}{4}$ , then the ratio A:B:C:D is

(\begin{matrix} \frac{- 6}{5} \div \frac{8}{9} \end{matrix}) \div \frac{7}{10} \neq \frac{- 6}{5} \div (\begin{matrix} \frac{8}{9} \div \frac{7}{10} \end{matrix})

1

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5 \times 9 = 144; 7 \times 8 = 151 : 4 \times 6 = 102,

2 \times 5 = ?

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