Question

If the cost of $3$ dozens of banana is $Rs60$, then:

_____ dozens of banana can be bought for $Rs30$

Answer 1

Given that,

Cost of $3$ dozens of banana $=$ $Rs60$

Assume, Cost of $x$ dozens of banana $=$ $Rs30$

In proportion , it can be written as

$3:x::60:30$

Therefore,

$$\begin{gathered} \frac{3}{x}=\frac{60}{30} \\ x=\frac{3\times 30}{60} \\ x=1.5 \end{gathered}$$

Hence, $1.5$ dozens of banana can be bought for $Rs30$