percentages Model Questions & Answers, Practice Test for ibps rrb po prelims
The population of a town is 126800. It increases by 15% in the 1st year and decreases by 20% in the 2nd year. What is the population of the town at the end of 2 years?
Answer: (c)
Population at the end of 2nd year
= $126800 × (1 + 15/100) × (1 - 20/100)$
= $126800 × 115/100 × 80/100$ =116656
The difference between 42% of a number and 35% of the same number is 110.6. What is 60% of that number?
Answer: (a)
According to the question,
(42 - 35)% of x = 110.6
or, number = ${110.6 × 100}/7 = 1580$
60% of 1580 = ${1580 × 60}/100 = 948$
36% of 4800 × 0.2% of 1320 = ?
Answer: (c)
$? = 36/100 × 4800 × 0.2/100 × 1320$
= 1728 × 2.64 = 4561.92
920 × ? % of 7.5 = 2898
Answer: (c)
${920 × ? × 7.5}/100 = 2898$
or ? = ${2898 × 100}/{920 × 7.5} = 42$
A student was awarded certain marks in an examination. However, after re-evaluation, his marks were reduced by 40% of the marks that were originally awarded to him so that the new score now became 96. How many marks did the student lose after re-evaluation?
Answer: (e)
Let the marks originally awarded be x.
x - 40% of x = 96
$x - {40x}/100 = 96 ⇒ {60x}/100 = 96$
$x = {96 × 100}/60$, ⇒ x = 160
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