Q&Answers: Math/Chemistry/Physics Problems + Solutions

David obtained 70, 60, 78, 60 and 65 marks (out of 100) in English, Mathematics,Physics, Chemistry and Biology What are his average marks ?

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Of the 19,210 employees of the anvil factory, 2/7 are journeymen.

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Three friends A, Band C started a business by investing a sum of money in the ratio of 5 : 7 : 6.

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If a particular player is never chosen, in how many ways can 11 cricket players be chosen out of 14 players?

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The ratio of Laxmi's age to the age of her mother is 3:11.

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If the product of two numbers is 82500 and their H.C.F. is 55, find their L.C.M.

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If k > 0, x + k = y, and y + 4k = z, what is the ratio between z - x and y - x ?

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Car A runs at the speed of 52km/hr & reaches its destination in 10hr.

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In a garden, 26 trees are planted at equal distances along a yard 300 metres long, one tree being at each end of the yard.

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a man and a woman, walking together start out by both taking a step with the left foot. in order to keep together, the man whose stride is longer, takes two steps while the woman takes three. how many steps will the woman have taken they are both about to step out on the right foot for the first time together?

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It costs $2 for the first 15 minutes to use the bumper cars at a fair ground.

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Bella is taking a trip in her car from New York (point A) Chicago, Illinois (point B).

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The banker's discount on Rs. 1600 at 15% per annum is the same as true discount on Rs. 1680 for the same time and at the same rate.

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A 12 lt solution is 33 1/3% acid.

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A man can row at 5 kmph in still water.

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If x > 7, which of the following is equal to (x^2 + 2x + 1)/(x^2 - 1) ?

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At Joel’s bookstore, the current inventory is 40% historical fiction.

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What is the decimal equivalent of (1/4)^2?

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2x + y = 18 |y|

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Find the simple interest on $1000 for 3 years at 10% per annum?

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If xy=1, x/y=36, for positive numbers x and y, y=?

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A train running at the speed of 240 km/hr crosses a pole in 21 seconds.

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In a school 10% of the boys are same in number as 1/6th of the girls. what is the ratio of boys to the girls in the school?

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At the faculty of Aerospace Engineering, 302 students study Random-processing methods, 232 students study Scramjet rocket engines and 112 students study them both.

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