Question

If a:b is the reciprocal ratio of 10:9, then a:b is ____

• A. 9 : 10
• B. 10 : 9
• C. 3 : 5
• D. 4 : 9

Answer 1

The correct option is A

9 : 10

Reciprocal ratio of 10:9 = $\frac{1}{10}$:$\frac{1}{9}$

= 9:10 = a:b