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Earn 100

At constant temperature, pressure of a definite mass of gas is inversely proportional to the volume. If the pressure is reduced by 20%, find the respective change in volume.

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Important Questions on Ratio, Proportion and Variation

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If 232 is divided among 150 children such that each girl and each boy gets 1 and 2 respectively, then, find the number of girls.
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If 620 bananas were distributed among three monkeys in the ratio 13:12:15, how many bananas did the first monkey get?
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A mixture contains milk and water in the ratio 3:1. On adding 5 litres of water, the ratio of milk to water becomes 2:1. Find the quantity of milk in the mixture.
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A beggar had one rupee, two rupess and five rupees coints in the ratio 5:15:12 respectvely at the end of the day. If that day he earned a total of 95, how many one rupee coins did he have?
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Sudhir has coins of the denomination of one rupee, 50 paise and 25 paise in the ratio 12:10:7. The total worth of the coins he has is 112.5. Find the number of 25 paise coins that Sudhir has.
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Two numbers are in the ratio 1:5 and if 10 be added to each, the ratio becomes 1:3. Find the lower number.
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A flask contains a mixture of 98 litres of alcohol and water in the proportion 5:2. How much water must be added to it so that the ratio of alcohol to water may be 7:5?
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A cask contains 15 litres of mixture of wine and water in the ratio 2:1. How much of the water must be drawn off, so that the ratio of wine and water in the cask may become 4:1?