Question
Six women and two men can
complete a task in 10 days. If the efficiency of a woman is twice that of a man, how many days will it take for eight women and five men to finish the same task?Solution
ATQ, Let the efficiency of each woman and each men be 'x' units/day and 'y' units/day Or, x = 2y Let the required number of days be 'd' days So, (6x + 2y) × 10 = (8x + 5y) × d Or, (12y + 2y) × 10 = (16y + 5y) × d Or, 14y × 10 = 21y × d So, d = (14y × 10)/21y = 20/3 = 6(2/3)
Tap P can fill the tank in 5 hours and Tap Q can empty it in `7(1/2)` hours. Tap P starts filling and they opened for 1 hour each alternatively. ...
The total age of A, B and C five years hence will be 85 years. Find the age of C four years hence, if the present age of A and B is 32 years and 21 year...
What is A's present age, if after 15 years his age will be 5 times his age 7 years back?
- The ratio of the current ages of Asha and Nisha is 5:4. If Asha’s age three years ago was equal to Nisha’s age four years from now, then what is Asha�...
The present ages of 'Isha' and 'Riya' are in the ratio 5:6. Two years from now, Isha’s age will be 20% less than Riya’s age. What is Isha’s curren...
Present average age of 4 friends: ‘A’, ‘B’, ‘C’ and ‘D’ is 40 years. If their ages are in the arithmetic progression in the same order a...
Four years ago, the ratio of ages of a brother and sister was 5:6 respectively. 3 years from now, the age of the sister will be twice that of the brothe...
The ratio of ages of P and Q after 12 years will be 7:4. If the present age of P is 150% more than the age of Q six years ago, find their present averag...
If 3 years is subtracted from the present age of R and the remainder is divided by 9, then the present age of his grandson A is obtained. If A is 4 yea...
The ratio of Meera’s father’s age to her mother’s age is H:K. If the father becomes 7 years older and the mother becomes 3 years younger, the rati...
Relevant for Exams:
