ABC26GN2991 · Ratio and Proportion

Subject: General Aptitude · Chapter: Ratio and Proportion · Exam: · Marks: · Difficulty:

If $a: b=7: 9$ and $b: c=15: 7$, then what is $a: c$ ?

(a)3 : 5

(b)5 : 3

(c)7 : 15

(d)7 : 21

Answer

Answer (as printed): B

Explanation

$\frac{a}{b}=\frac{7}{9}$ and $\frac{b}{c}=\frac{15}{7} \Rightarrow \frac{a}{c}=\left(\frac{a}{b} \times \frac{b}{c}\right)=\frac{7}{9} \times \frac{15}{7}=\frac{5}{3} \Rightarrow a: c=5: 3$.

Explanation as extracted from the printed page; notation may be imperfect.

Open in whiteboard · Browse this chapter in the app