Four years ago, the average age of Mr. and Mrs. Fernando and their daughter was 25 years and six years ago, the average age of Mrs. Fernando and the daughter was 22 years. What is the present age of Mr. Fernando?

A surveyor made an error of 3% in excess of the actual length when measuring the length of the side of a square plot. Then he calculated the area of the square plot by using that value. What is the percentage of the error in the calculation of area?

To make a drink, juice A is mixed with juice B in the ratio 4:3 in a jug. After serving 7 litres of this drink from the jug, another 7 litres of juice B were added to the jug making the new ratio of juice A to juice B in the jug 4:5. How many litres of juice A were used initially?

Mrs. Perera bought 120 blouses at the rate of Rs. 375 per blouse from a wholesale market. It cost Rs. 1200 to transport them to her store. Further, she had to spend Rs. 25 as ironing charges per blouse and a total of Rs. 2400 as packaging charges before selling the items. Now, she plans to sell them with a profit of 30% from each blouse. What should be the selling price of a blouse?

Mr. Silva deposited on the same day a total of Rs. 150 000 in two banks A and B, at simple annual interest rates of 8% and 10% respectively. After a period of two years, he earned a total simple interest of Rs. 27 200 for his two deposits. What was the amount he initially deposited in the bank B?

Two men are walking in the same direction at the rate of 2 km h^-1 and 3 km h^-1 parallel to a railway line. A train engine travelling in the same direction overtakes them completely in 9 seconds and 12 seconds respectively. What is the length of the train engine?

A factory has two machines A and B, producing the same item. Machine A takes 6 hours to produce 32 items and Machine B takes 5 hours to produce 40 items. The two machines start at the same time to produce 220 items. How much time will they take?