Question

If $\frac{a}{b}=\frac{c}{d}=5$, then $\frac{3a+4c}{3b+4d}$ is equal to?

• A. 60
• B. 15
• C. 5
• D. 20

Answer 1

Answer:

C. 5

Soltion:

Given; $\frac{a}{b}=\frac{c}{d}=5$

Let $a=c=5 and b= d= 1$

To Find: $\frac{3a+4c}{3b+4d}$

$=\frac{3(5)+4(5)}{3(1)+4(1)}$

$=\frac{15+20}{7}$

$=\frac{35}{7}=5$

Hence the answer is option(C).