A box contains 200 marbles, 25% of which are of black colour. Babu took some marbles from the box found that 30% of them are black. Of the remaining marbles, 10% were black marbles. How many marbles did Babu take?

If Arif works alone he will take 20 more hours to complete a task than if he works with Babu to complete the t...

A fruit salad is made by mixing 3 kgs of mango costing Tk 120 per kg and 2kgs of papaya costing Tk 100 per kg...

The members of a club participate in at least one game. Twenty of them play football, 10 play cricket, 12 play...

The cost of carpeting a room 18m long with a carpet 75 m wide at Tk. 4.50 per metre is Tk. 810. The breadth of...

A shopkeeper sold article offering a discount of 5% and earned a profit of 23.5%. What would have been the per...

A group of 1200 persons consisting of captains and soldiers is travelling in a train. For every 15 soldiers th...