ATQ, Let the number of 10 rupees coins in the piggy bank be 'p'. So, the number of 5 rupeees coins in the piggy bank = 0.7p And the number of 20 rupees coins in the piggy bank = 0.70/1.75 = 0.4p So, the total number of coins in the piggy bank = p + 0.7p + 0.4p = 2.1p So, the probability that a 5 rupees coins and a 10 rupees coins are drawn = pC1 × 0.7pC1/ 2.1pC2 = 1/3 (2p × 0.7p) / {2.1p (2.1p - 1) } = 1/3 2.1p - 1 = 2p 0.1p = 1, p = 10 So, the total number of coins in the piggy bank = 2.1 × 10 = 21
A Company allow 8% commission on the total sales to its salesman but if the salesman is appointed on a fix salary of Rs. 10000 and 6% commission on the...
Monthly income of Aisha and Tom is Rs. 75,200 and Rs. 82,000 respectively. Aisha spends 13%, 18%, and 22% on house rent, food, and education of children...
In an election there are a total of 4,000 registered voters out of which x% of voters did not cast their votes and 180 votes are declared invalid. The w...
Lakshit allocates his income in the following manner: 24% is spent on food. After food expenses, he uses 25% of the balance on rent. He spends one-third...
A plane can travel 36 km against the wind and 80 km with the wind in 4 hours. How much percent is the speed of the plane against the wind less than the ...
A man spent 20% of his income in May. If his savings is increased by 20% in June and becomes Rs. 11520, then find the income of man in May.
In a test, P got 26% of total marks and failed by 30 marks while Q got 46% of total marks which is 24 more than passing marks. Find the total marks of t...
A racing car going at an average speed of 108 km/hr takes 15 minutes to complete a lap on a racing track. By how much should it increase its speed (in ...
A man spends 23% and 10% of his monthly salary on rent and transportation, respectively. Out of the remaining money, he spends 31% on food and 46% on en...
A housewife saved Rs. 2.50 in buying an item on sale. If she spent Rs. 25 for the item, approximately how much percent she saved in the transacti...
