Question

If 1.2 ∶ 3.9 ∶∶ 2 ∶ a, then find the value of a.

• A. 6.5
• B. 6.9
• C. 6.3
• D. 6.1

Answer 1

Answer:

A. 6.5

Solution:

Given: 

If 1.2 ∶ 3.9 ∶∶ 2 ∶ a 

Calculation : 

1.2 ∶ 3.9 ∶∶ 2 ∶ a 

$\frac{1.2}{3.9}=\frac{2}{a}$

⇒ 1.2a = 2 × 3.9

⇒ 1.2a = 7.8

$a=\frac{7.8}{1.2}$

=6.5