percentages Model Questions & Answers, Practice Test for ssc chsl tier 1

Answer: (b)

Let the income of Shilpa be = Rs. x

$[x - {(8 + 25 + 17)x}/100](1 - 25/100) = 6000$

${50x}/100 × 75/100 = 6000$

$x = {6000 × 100 × 100}/{50 × 75} = 16,000$

Expenditure on rent = 16000 × $25/100$ = Rs. 4000

Answer: (c)

Change in volume

= $x + y + z + {xy + yz + zx}/100 + {xyz}/10000$

Here, x = y = z = 20%

Change in volume

= $20 + 20 + 20 + {20 × 20 + 20 × 20 + 20 × 20}/100 + {20 × 20 × 20}/10000$

= $60 + 1200/100 + 8/10 = 72.8 ≈ 73%$

Answer: (c)

Let the required quantity of water = x litres

According to the questions,

$70 × 10/100 + x = (70 + x) × 12.5/100$

⇒ x = 2

Answer: (c)

960 × $58/100 - {635 × ?}/100 = 277.4$

960 × 58 – 635 × ? = 277.4×100

55680 – 635 × ? = 27740

635 × ? = 55680 – 27740 = 27940

? = $27940/635$ = 44

Answer: (a)

∵ $\text"Marks of y"/\text"Marks of x" = {100 + %\text"above minimum of y"}/{100 + % \text"above minimum of x"}$

⇒ $710/515 = {100 + y}/103$

⇒ $100 + y = {710 × 103}/515 = 142$

⇒ y = 42%