let the price of one pencil = x and the price of one pen = y ATQ- 2x + 3y = 55 .... (1) 7x +2y = 65 ......(2) Eq (1) multiplied by 2 and eq (2) multiplied by 3. 4x +6y = 110 21x +6y =195 17x = 85 x = 5 put the value of x in eq (1) y =15 now price of 2 pencils + 1 pens =2 × 15+5= 35
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A certain sum of money will be doubled in 25 years at the rate of simple interest percent per annum is:
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The difference between the simple interest and the compound interest compounded annually at the same rate on a sum of money at the end of two years is R...
If the ratio of the sum invested and simple interest received after 1 year is 20:9 respectively, then find the rate of interest.
