The sides of a rectangular piece of paper is 2:3. If the area is 150 sq.cm, find the length of its sides.
An alloy consists of 30% copper and 40% zinc, and the remaining is nickel. Find the amount of nickel in 20 kg of alloy.
Which is a better investment? - Rs. 5600 for 8 yrs at 6% or 5000 for 10 yrs at the rate of 5%