Aarav can do a piece of work alone in 6 days, and Babita can do it alone in 8 days. Aarav and Babita undertook to do it for ₹2,400. With the help of Chaitanya, they completed the work in 3 days. How much is to be paid to Babita?
₹900
The correct answer is Option 2 i.e. ₹900.
LCM(6, 8 and 3) = 24
The efficiency of Aarav = 24/6 = 4 units
The efficiency of Babita = 24/8 = 3 units
The efficiency of (Aarav, Babita, and Chaitanya) = 24/3 = 8 units
So, the efficiency of Chaitanya = 8 - (4 + 3) = 8 - 7 = 1 unit
Amount paid to Babita = \(3\over{8}\) × 2400 = ₹900
Important Questions from Age
The ages of two persons P and Q are in the ratio 5 : 7. Eight years ago, the ratio of P and Q was 7 : 13. The present ages of P and Q, respectively, are:
One year ago, the ratio of the ages of A and B was 4 : 3. The ratio of their ages, after 7 years from now, will be 9 : 7. What is the present age (in years) of B?
In 8 years, Subhash will be 3 times as old as he is now. After how many years will Subhash be 5 times as old as he is now?
The average ages of parents and two children are 30 years and 8 years respectively. The average age of the family is
A. 16 years
B. 19 years
C. 18 years
D. 17 years
A father is presently 3 times his daughter’s age. After 10 years he will be twice as old as her. Find the daughter’s present age.
