If a:b = 5:7 and c:d = 2a:3b,then ac:bd is :1). 20:382). 50:1473). 10:214). 50:151
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= $\frac{a}{b}=\frac{5}{7}$= $\frac{c}{d}=\frac{2a}{3b}$
= $\frac{ac}{bd}$=$\frac{10}{21}\times\frac{5}{7}$= $\frac{50}{147}$ .
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