A motorist travels to a place 150 km away at an average speed of 50 km and returns at 30 km per hour. His average speed for the whole journey in km per hour is-

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If the length of a rectangle is increased by 20% and width is decreased by 20% what is the change in area of the rectangle?

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In how many ways a team of 11 members can be formed from a group of 15 students if a students who is the owner of the ball is always considered a member of the team?

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At the beginning of a class period, half of the students in a class go to the library. Later in the period, half of the remaining students go to the computer lab. If there are 8 students remaining in the class, how many students were originally in the cla

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The dimensions of a box are 2, 3 and 4 meters. The cost of painting the outer sides of the box at the rate of taka 3 per square meter is-

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A coin is tossed twice. What is the probability of getting head on first toss and tail on second toss?

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