Question

If a:b = 7:5 and c:d = 2a:3b, then ac:bd is ________​

Answer 1

Answer:

20 : 38

[B]50 : 151

[C]50 : 147

[D]10 : 21

50 : 147

\frac{a}{b} = \frac{5}{7}, \frac{c}{d} = \frac{2a}{3b}

=> \frac{a}{b}\times\frac{c}{d} = \frac{5}{7}\times\frac{2a}{3b}

=> \frac{ac}{bd} = \frac{10}{21}\times\frac{5}{7}

=> \frac{ac}{bd} = \frac{50}{147}= 50 : 147

Answer 2

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