Let the total work be 80 units (LCM of 16 and 10).
Combined efficiency of X and Y = 5+8=13 units/day. Work done by X and Y together in 4 days = 13×4=52 units. Remaining work = 80−52=28 units. 
Efficiency of Z = 7−5=2 units/day.
Novita's current age is 37.5% greater than Suzuka's, with a difference of 15 years between their ages. Calculate the ratio of Novita's age to Suzuka's a...
A is younger than B by 5 years. If the ratio of A and B ages is 6:7 respectively, then find the age of A.
The total age of A, B and C six years hence will be 89 years. Find the age of C five years hence, if the present age of A and B is 33 years and 24 years...
Present ages of 'P' and 'Q' are in ratio 5:6, respectively. If ten years hence from now, age of 'P' will be 25% less than that of 'Q', then find the rat...
What is the value of 'x' such that, given their current ages are in a 3:7 ratio, 'x' years ago, the ratio of 'Adarsh' and 'Malik's ages was 1:3, and if ...
7 years ago, Meera’s age was equal to the Heena’s present age. The sum of Meera’s age 10 years from now and Heena’s age 5 years ago is 94 yea...
Present age of ‘A’ is 40% more than that of ‘B’. If 11 years hence from now, ‘B’ will be 5 years younger than ‘A’, then find the sum of ...
P says to Q ‘’ I am thrice as old as you were when I was as old as you are’’. The sum of their ages is 100 years. Find the difference of their ...
Present ages of 'A' and 'B' are in the ratio 3:5, respectively. If B's age, 8 years hence from now will be 3 times of A's age, 2 years ago from now, the...
The respective ratio of the present ages of A and B is 5:6. The present age of C is 20% more than that of B. The sum of the present ages of A, B and C i...
