Question
Four years ago from now age of 'A' was 16 years. 'B' is
8 years younger than 'A'. After how many years from now, ratio of age of 'A' and 'B' will be 7:5 respectively?Solution
Present age of 'A' = 16 + 4 = 20 yearsPresent age of 'B' = 20 - 8 = 12 yearsLet the required time be 'n' years.So, (20 + n) :(12 + n) = 7:5Or, 5 X (20 + n) = 7 X (12 + n)Or, 100 + 5n = 84 + 7nOr, 2n = 16Or, 'n' = 8
X men can complete the piece of work in 32 days and (X + 30) men can complete the same work in 15 days less than that of days taken by X men. Find the v...
x men can finish a work in y days. 0.9x women can finish 1/3rd of the same work in (y - 8) days. If 0.8x women can complete 1/3rd work in 36 days. Find ...
Pawan can finish a task in 28 days, while Bhavna requires 7 more days than Pawan to complete the same task. They both started wor...
A, B, and C can complete a task individually in 45, 35, and 63 days respectively. They start working together, but A leaves 24 days before the work is c...
‘P’ alone can complete a work in 25 days while ‘P’ and ‘Q’ together can complete the whole work in 15 days. Find the time taken by ‘Q’ a...
‘A’ and ‘B’ can complete a certain work in 13 days and 26 days, respectively. They started working together and worked till completion of the wo...
Bharti, Chiku, and Diksha complete 30%, 40%, and 20% of a task in 6 days, 12 days, and 8 days, respectively. How many days will it take for them to coll...
Sudhir is 4.5 times as efficient as Aarav. If they work together, they can complete a piece of work in 9 days. How many days will Aarav take to do the s...
A man travelled a total distance of 200 km. He travelled first 150 km on car with a speed of 30 km/h and rest of the distance on bike whose speed is 20 ...
A alone can do a piece work in 15 days and the time taken by A alone is 50% more than the time taken by B. They started work together alternatively star...
Relevant for Exams:
