PPSC MCQs

The total ratio parts are 7, so one part is 35/7 = 5 liters.
Water is two parts, or 10 liters.

One hundred fifty percent equals 1.5.
Multiplying 80 by 1.5 gives 120.

Thirty percent of 20 liters is 0.30 × 20.
This equals 6 liters.

Since 12.5% = 1/8, one eighth of the number is 25.
The whole number is 25 × 8 = 200.

The solution contains 4 liters of salt, which remains unchanged.
For salt to be 25%, total volume must be 16 liters, so 6 liters are added.

After a 30% discount, 70% of the original price remains.
Thus, the original price is 840 ÷ 0.70 = 1,200.

For direct variation, x/y is constant.
The constant is 18/6 = 3, so x = 3 × 10 = 30.

The decrease is Rs. 75.
The percentage decrease is 75/500 × 100 = 15%.

Let the number be x, so 0.40x = 72.
Dividing by 0.40 gives x = 180.

Percent means per hundred.
Thus, 3.5% = 3.5 ÷ 100 = 0.035.

The required percentage is 45/250 × 100.
This equals 18%.

The score fraction is 42/50.
Multiplying by 100 gives 84%.