Question
A box contains eight Rs. 1 coins, ten Rs. 2 coins, and two
Rs. 5 coins. One coin falls out and gets lost. What is the probability that the lost coin is not a Rs. 5 coin?Solution
Number of Rs. 5 coins = 2
Total number of coins = 8 + 10 + 2 = 20
So, the required probability = 1 - 2/20 = 18/20 = 9/10
A took a loan of Rs.5320 at simple interest of 20% p.a. and invested the same money in a scheme at simple interest of 30% p.a. Find the profit earned by...
Simple interest on a sum of Rs.5100 at some r% is for t years is Rs.918. If r and t are integers and 1 < r < t, then find the minimum simple interest ea...
A certain sum of money becomes 6 times of itself in 25 years at simple interest. In how many years does it become double of itself at the same rate of s...
A sum of Rs. 3800 is invested at simple interest for 2 years. If the rate interest for first year is 12% p.a. while 20% p.a. for second year, then find ...
A certain sum of money becomes Rs. 1300 in 1 year and 2700 in 3 years at certain rate of simple interest. Find the sum of money invested.
A certain amount invested at 16% p.a. compound interest, compounded annually, grows to Rs. 6969.6 in 18 months. What wil...
A borrowed Rs. 7500 from B for his business. How much amount A will return to B at the end of 25 months such that the sum was borrowed at simple interes...
Suppose 'S' invested Rs. 40,000 each at 12% p.a. in two different Funds for 2 years, with one Fund offering compound interest (compounded annually) and ...
Rs. 8500 is invested in scheme ‘A’ for 2 years and Rs. 6500 is invested in scheme ‘B’ for 2 years. Scheme ‘A’ offers simple interest of 13% ...
An equal sum of money is invested in two schemes which offer interest at the same rate but one at simple interest and the other at compound interest (co...
