If 1/2(2x+3Y)+12/7(3x-2Y) = 1/2 and 7/2x+3y+4/3x-2y=2 then values of x and y are respectively.

A school boy walks from his house to school at the rate of 4 kmph. He reaches the school 20 minutes earlier than the schedule time. If he walks at the rate of 3 kmph, he reaches the school 20 minutes late. What is the distance of the school from his house

A number is increased by 10% and then decrease by 10%. Find the net decrease percent.

Find the compound interest on Rs. 31250 at 8% p.a for 3 years compounded annually

Product of two positive number is 34560. The LCM is sixty times of its GCD. Then the difference of LCM and GCD is 

If radii of two cylinders are in the ratio 5 : 3 and their heights are in the ratio 3 : 5 then ratio of their volumes is