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Subject Mathematics
1951. The difference of two numbers is 20% of the larger number. If the smaller number is 20, then the larger number is:
1955. A and B can do a work in 8 days, B and C can do the same work in 12 days. A, B and C together can finish it in 6 days. A and C together will do it in:
1956. Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively. Both the pipe together but after 4 minutes, pipe A is turned off. What is the total time required to fill the tank?
1960. The simple interest on a sum of money will be Tk. 600 after 10 years. If the principal is trebled after 5 years, what will be that total interest at the end of the tenth year?
1961. The compound interest on a certain sum for 2 years at 10% per annum is Tk. 525. The simple interest out the same sum for double the time at half the rate percent per annum is
1962. The length of a rectangle is 18 cm and its breath is 10 cm. When the length increased to 25 cm, what will be the breadth of the rectangle if the area remains the same?