Question

18	6
33	11
x	15
60	20

In the ratio table above, find x?

• A. $45$
• B. $40$
• C. $55$
• D. $55$

Answer 1

The correct option is A $45$

18	6
33	11
x	15
60	20

$18:6=3:1$
$33:11=3:1$
$60:20=3:1$

$\therefore$ Ratios in the given table are equivalent.

Hence, ratio in the third row is also equivalent to $3:1.$
$\Rightarrow x:15::3:1$
$\Rightarrow \frac{x}{15}=\frac{3}{1}$

Cross multiplying, we get
​​​​​​​
$\Rightarrow x\times 1=3\times 15$
$\Rightarrow x=45$