1. Find the smallest number which when diminished by 3,is exactly divisible by 21,28,36 and 45.
2.If we multiply a fraction by itself and divide the product by its reciprocal , we get 1826/27. Find the original fraction.
3. By what least number must 21,600 be multiplied to make it a perfect cube?
4.Solve 0.5 * 0.05 * 0.005 * 50
5. The value of a machine depreciates at the rate 10% every year. It was purchased 3 years ago.If its present value is Rs 8,748 , find its purchase price.
6. On a journey across Delhi , a taxi averages 30 kmph for 60% of the distance,20kmph for 20% of it and 10 kmph for the remainder. Find the average speed for the whole journey.
7. A mixture contains alcohol and water in the ratio of 4:3 .If 7 litres of water is added to the mixture, the ratio of alcohol and water becomes 3:4 . Find the quantity of alcohol in the mixture.
8. A and B can do a piece of work in 12 days, B and C in 15 days,C and A in 20 days.In how many days A alone will do the work?
9. At a certain rate of simple interest, a certain sum doubles itself on 10 years,it will treble itself?
10. If the ratio of the areas of two squares is 9:1 ,then what will be the ratio of their parameters?
11. If a commission of 10% is given on the written price of an article ,the gain is 20 % .Find the gain percent if the commission is increased to 20 %.
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