Question

The age of a man is $\frac{2}{5}$th of the age of a tree in his housing complex. The tree is 90 years old. If the man's age multiplied by a number $x$ equals 180, find $x$.

• A. 4
• B. 5
• C. 10
• D. 8

Answer 1

The correct option is B

5

Given : Age of the tree = 90 years

$\therefore$ Man's age = $\frac{2}{5}\times 90=36years$

36 $\times x=180$ (given)

$\Rightarrow x=\frac{180}{36}=5$