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Solve sums of arithmetic

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1. Find the smallest number which when diminished by 3,is exactly divisible by 21,28,36 and 45.   Answer:-   1263   2.If we multiply a fraction by itself and divide the product by its reciprocal , we get 1826/27. Find the original fraction. Answer :-   2  2                            3 3. By what least number must 21,600 be multiplied to make it a perfect cube? Answer :-  10 4.Solve   0.5 * 0.05 * 0.005 * 50 Answer:-  0.006250 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. Answer :-  Rs 12,000 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. Answer:-  20 km ...