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Subject Mathematics
601. A father is three times as old as his son. After fifteen years the will be twice as old as his son's age at that time. Hence the father's present age is -
603. A rectangle is 14 cm long and 10 cm wide. If the length is reduce by x cms and its width is increased also by x cms so as to make it a square, then its area changes by:
604. There 'e' students in a school studying English and 'a' student studying Arabic. How many students study English and Arabic or both, of 'b' students study both?
612. If the lengths of the three sides of a triangle are consecutive integers, then the smallest possible value of the sum of the lengths of the three sides is
615. A zookerper counted the heads of the animals in a zoo and found it ti be 80. When he counted the legs of the animals he found it to be 260. If the zoo had either pigeons or horses, how many horses were in the zoo?
616. When a student weighing 45 kgs left a class, the average weight of the remaining 59 students increased by 200g. What is the average weight of the remaining 59 students
617. The average temperature on Wednesday, Thursday and Friday was 25°C. The average temperature on Thursday, Friday and Saturday was 24°C. If the temperature on Saturday was 27°C, what the temperature on Wednesday?
619. The average daily earning of a man who makes TK 25 each of the first 9 days, Tk 30 each of the nest 10 days and Tk 40 each of the last 11 days is TK
620. A ship leaves port and sails 6 miles west. It then sails 6 miles south and then 6 miles west again. Approximately how many miles the ship from port?