Question

5. If a : b=c:d the ad = bc is
a) true
b) false
c) a, b both
d) none
​

Answer 1

a:b = c:d

$\frac{a}{b} = \frac{c}{d}$

Cross multiply

$ad = cb$

${\sf{\orange{(a)~True}}}$

Answer 2

$\bf\large\green{\underline{\underline{\overline{HERE\:IS\: YOUR\:ANSWER}}}}$

$a : b=c:d$

$\frac{a}{b}=\frac{c}{d}$

$ad=bc$

$\bf\huge\orange{\boxed{TRUE}}$