Question

If $a:b=3:4$ and $b:c=8:9$ , then $a:c=$ ?

• A. $1:2$
• B. $3:2$
• C. $1:3$
• D. $2:3$

Answer 1

The correct option is D $2:3$

Given $a:b=3:4$ and $b:c=8:9$
Then $\frac{a}{b}\times \frac{b}{c}=\frac{3}{4}\times \frac{8}{9}$

$\therefore \frac{a}{c}=\frac{2}{3}$

$\therefore a:c=2:3$