A man has donated 30% of his property as charity and then gave the rest to his wife. The wife has contributed 50% of her property as charity. If wife has contributed Tk. 21,000 what was the contribution of the man as charity?

In a restaurant, the cost of an identical three-item lunch for five people was Tk. 900. The main item cost thrice as much as the desert and the desert cost twice as much as the starter. How much did the main item cost for each person?

A rectangular plot has a concrete path running in the middle of the plot parallel to the breadth of the plot. The rest of the plot is used as a lawn, which has an area of $240m^2$. If the width of . the path is 3m and the length of the plot is greater than its breadth by 2m, what is the area of the rectangular plot?

A pipe can fill a tank in 0.9 hours and another pipe can empty in 0.7 hours. If tank is completely filled and both pipes are opened simultaneously then 450 liters of water is removed from the tank in 2.5 hours. What is the capacity of the tank?

A motorist and a cyclist start from A to B at the same time. A to B is 18km. The speed of motorist is 15 m/hr, more than the cyclist. After covering half the distance, the motorist rests for 30 minutes and thereafter his speed is reduced by 20%. If the motorist reaches the destination B, 15 min earlier than that of the cyclist, then find the speed of the cyclist.