Sixty-five percent of a number is 21 less than; four-fifth of that number.What is the number?

A sells an article which cost him TK.400 to B at a profit of 20%.B then sells it to C, making a profit 10% on...

The ratios of incomes of A and B is 5:4 and the ratio of their expenditures is 3:2. If at the end of the year...

A started a business with tk 21000 and is joined afterwards by B with tk 36000. After how many months did B jo...

If 12 carpenters, working 6 hours a day,can make 460 chairs in 24 days, how many chairs will 18 carpenters mak...

A and B can do a work in 12days,B and C in 15days,C and A in 20days.If A,B and C work together ,They will comp...

A tap can fill a tank in 6hours.After half hour the tank filled ,three more similar taps are opened.What is th...