Three workers can do a job in 12 days . Two the workers work twice as fast as the third. How long would it take one of the faster workers to do the job himself?

A 20% reduction in price allows a customer to purchase 5 kgs of rice at Tk. 160. How much would have to pay if...

How many pupils can be seated in a room with N single chairs and B double seated benches?

Jasim is shorter than Joli, but taller than Anika, Dina is shorter than Jasim, Malek is shorter than Joli but...

The sum of prime numbers that are greater than 60 but less than 70 is --

In a horticulture experiment , 200 seeds were planted in plot I and 300 were planted in plot II. 57 percent of...

Rahim is now 14 years older than Karim . If in 10 years Rahim will be twice as old as Karim, how old will Rahi...