Madhya Pradesh Police Exam Model Paper 7

Given:
40% of a number is less than its 60% by 30.
Formula:
x% of a number = Actual number × (x/100)
Calculation:
Let a number be x, then
According to the question
$\mathit{x}\times \left(60/100\right)-\mathit{x}\times \left(40/100\right)=3$ 0
$\Rightarrow \mathit{x}\times \left(20/100\right)=30$
$\Rightarrow \mathit{x}=30\times 5$
⇒ x = 150
Hence, 20% of 150
$\Rightarrow 150\times \left(20/100\right)$
⇒ 30