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By combining all the three statements, Average age of student and teacher = 16 × 14 = 224 years. Average age of 13 students = 16 – 4 = 12 years. Total age of 13 students = 13 × 12 = 156 years. ∴ Teacher’s age = 224 – 156 = 68 years.
P, Q, R and S can do a piece of work in 20 days. If P and Q together can do it in 50 days, and R alone in 60 days, then in how many days can S alone do it?
P does one fourth as much work as Q in two third of the time. If together they take 24 days to complete the work, how much time shall Q take to do it?
A can do a job in 24 days, while B can do the same job in 30 days. They started the work together, but A left after 6 days. In how many more days will B...
Ratio of the work done by P, Q and R in one day is 6:4:7 respectively. They all together can complete the work in 45 days. Q and R worked on it for 27 d...
Machine X is 100% more efficient than Machine Y, and Machine Y is 75% more efficient than Machine Z. Machines X and Z, working together, can complete a ...
P, Q, R can do a piece of work in 40 days, 90 days, and 36 days, respectively. P started the work. Q joined him after 8 days. If R joined them after 9 d...
Ram can do a work in 60 days while Mohan can do the same in 84 days. If Ram work for 'x' days while Mohan work for ' x + 2' days then one-third of the w...
Three Typists Axe, Wye and Zed working together 3 hours per day and can type 720 pages in 12 days. In a day Wye types as many pages more than Axe as Zed...
‘A’ and ‘B’ can do a piece of work in 25 days and 30 days, respectively. If they started the work together and worked on it for 8 days, then fin...
40 tailors can stitch a batch of dresses in 30 days. If 20 tailors started the job and after 15 days ‘u’ more tailors joined them such that the rema...
