Mira is 30 times older than her son. 18 years later she will be thrice as old as her son. What is Mira's present age?

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The population of a center town increases by 50% every 50 years. If the population in 1959 was 810, in what year was the population 160?

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The three sides of a triangle are x+1, 2x-1 and 3x+1 respectively and the perimeter is 25 cm. The length of the smallest side 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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