percentage Model Questions & Answers, Practice Test for ssc cgl tier 2
The price of oil is increased by 25%. If the expenditure is not allowed to increase, the ratio between the reduction in consumption and the original consumption is
Answer: (c)
Let original consumption be 1 unit costing Rs. 100
New cost = Rs.125.
New consumption = $(1/125 × 100) = 4/5$ unit.
∴ $\text"Reduction in consumption"/\text"Originalconsumption"$
= $(1 - 4/5)/1 = 1/5$, i.e., 1 : 5.
(739% of 383) ÷ 628 ≈ ?
Answer: (a)
$? = (383 × 739/100) ÷ 628$
≈ $({380 × 740}/100)$ ÷ 630 ≈ 2812 ÷ 630 ≈ 4.46 ≈ 4.50
Recently I had gone to a locality called Shadigarh for conducting a survey about the number of married persons in the locality. The population of the locality is 7,200 and 1$1/18$ th of those are males and the rest females. If 40% of the males are married, find percentage of married females in the locality
Answer: (c)
No. of males = $11/18 × 7200$ = 4400
No. of males married = $40/100 × 4400$ = 1760
No. of females married = 1760
Required percentage = $1760/2800 × 100 = 62{6}/7 %$
An empty fuel tank of a car was filled with A type petrol. When the tank was half-empty, it was filled with B type petrol. Again when the tank was half-empty, it was filled with A type petrol. When the tank was half-empty again, it was filled with B type petrol. What is the percentage of A type petrol at present in the tank ?
Answer: (a)
Let the capacity of the tank be 100 litres.
Then, Initially : A type petrol = 100 litres.
After first operation :
A type petrol = $(100/2)$ = 50 litres;
B type petrol = 50 litres.
After second operation :
A type petrol = $(50/2 + 50) = 75$litres;
B type petrol = (50/2) = 25 litres
After third operation :
A type petrol = $(75/2)$ = 37.5 liters;
B type petrol = $(25/2 + 50)$ = 62.5 litres.
∴ Required percentage = 37.5%.
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