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

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If a:b = 5:7 and c:d = 2a:3b,then ac:bd is :
1). 20:38
2). 50:147
3). 10:21
4). 50:151

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2 answers

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Answered by on | Votes 1 |
50:147 is the answer

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1 vote
Answered by on | Votes 1 |

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

= $\frac{ac}{bd}$=$\frac{10}{21}\times\frac{5}{7}$= $\frac{50}{147}$ .




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