Free Ncert Solutions for 7th Class Mathematics Comparing Quantities - Studyadda.com

s Free Ncert Solutions for 7th Class Mathematics Comparing Quantities - Studyadda.com

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Comparing Quantities

1)

Find the ratio of: (a) ` 5 to 50 paise (b) 15 kg to 210 g (c) 9 m to 27 cm (d) 30 days to 36 hour
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2)

In a computer lab, there are 3 computers for every 6 students. How many computers will be needed for 24 students?
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3)

Population of Rajasthan \[=\text{ 57}0\text{ lakhs}\] and population of UP \[=\text{ 166}0\text{ lakhs}\]. Area of Rajasthan \[=\text{3 lakh}\] km2 and area of UP \[=\text{2 lakh}\] km?. (i) How many people are there per km2 in both these States? (ii) Which State is less populated?
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4)

Convert the given fractional numbers to percents. (a) \[\frac{1}{8}\] (b) \[\frac{5}{4}\] (c) \[\frac{3}{40}\] (d) \[\frac{2}{7}\]
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5)

Convert the given decimal fractions to percents. (a) 0.65 (b) 2.1 (c) 0.02 (d) 12.35
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6)

Estimate what part of the figures is coloured and hence find the percent which is coloured (i) (ii) (iii)
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7)

Find (a) 15% of 250 (b) 1% of 1 hour (c) 20% of ` 2500 (d) 75% of 1kg.
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8)

Find the whole quantity if (a) 5% of it is 600. (b) 12% of it is ` 1080 (c) 40% of it is 500 km. (d) 70% of it is 14 minutes. (e) 8% of it is 40 litres.
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9)

Convert given percents to decimal fractions and also to fractions in simplest forms: (a) 25% (b) 150% (c) 20% (d) 5%
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10)

In a city, 30% are females, 40% are males and remaining are children. What Percent are children?
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11)

Out of 15,000 voters in a constituency, 60% voted. Find the percentage of voters who did not vote. Can you now find how many actually did not vote?
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12)

Meeta saves ` 400 from her salary. If this is 10% of her salary. What is her salary?
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13)

A local cricket team played 20 matches in one season. It won 25% of them. How many matches did they win?
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14)

Tell what is the profit or loss in the following transactions. Also find profit per cent or loss per cent in each case. (a) Gardening shears bought for ` 250 and sold for ` 325. (b) A refrigerator bought for `12,000 and sold at ` 13,500. (c) A cupboard bought for ` 2,500 and sold at ` 3,000. (d) A skirt bought for ` 250 and sold at ` 150.
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15)

Convert each part of the ratio to percentage (a) 3:1 (b) 2:3:5 (c) 1:4 (d) 1:2:5
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16)

The population of a city decreased from 25,000 to 24,500 Find the percentage decrease.
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17)

Arun bought a car for ` 3, 50,000. The next year, the price went upto ` 3, 70, 000. What was the percentage of price increase?
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18)

I buy a T. v for ` 10,000 and sell it at a profit of 20% . How much money do I get for it ?
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19)

Juhi sells a washing machine for ` 13,500 she loses 20% in the bargain. What was the price at which she brought it?
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20)

(i) Chalk contains calcium, carbon and oxygen in the ratio 10: 3: 12. Find the percentage of carbon in chalk. (ii) If in a stick of chalk, carbon is 3 g, what is the weight of the chalk stick?
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21)

Amina buys a book for ` 275 and sells it at a loss of 15%. How much does she sell it for?
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22)

Find the amount to be paid at the end of 3 years in each case: (a) Principal = ` 1,200 at 12% p.a. (b) Principal = ` 7,500 at 5% p.a.
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23)

What rate gives ` 280 as interest on a sum of ` 56,000 in 2 years?
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24)

If Meena gives an interest of ` 45 for one year at 9% rate p.a. What is the sum she has borrowed?
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