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

On the xy-coordinate plane, point A lies on the y-axis and point B lies on the x-axis.

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A can complete a work in 18days and B can do the same work in 10days.

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If x2 - y2 = -12 and x + y = 6, find x and y.

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If n is the smallest integer such that 108 times n is the square of an integer, what is the value of n?

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If p and r are integers, and p^2 = 20r, then r must be divisible by which of the following?

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The difference between the weights of two girls is 10 kgs.

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If 25 men do a work in 96 days, in how many days will 40 men do it?

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Four different children have jelly beans: Aaron has 7, Bianca has 7, Callie has 8, and Dante has 11.

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The ratio between the number of sheep and the number of horses at the Stewar farm is 3 to 7.

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On average, the bottle-nosed dolphin comes up for air once every two minutes; the beluga whale, a close relative, comes up for air on average once every five minutes.

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Set A consists of all the prime numbers between 12 and 32.

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12.5 * 3.2 * 6.8 = ?

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By how much is three-fifth of 250 greater than four- seventh of 210 ?

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One robot builds a robot in 1 hour, another one builds a robot in 2 hours.

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In a mayoral election, Candidate X received 1/3 more votes than candidate Y, and Candidate Y received 1/7 fewer votes than Z.

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There are n cities. What is the number of airlines that connected 4 different cities (airline from city A to city B is different with airline from city B to city A)?

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A father said to his son, "I was as old as you are at the present at the time of your birth".

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25 * 25* 25 * 25 * 25 = 5^ ?

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Three numbers A,B,Care in ratio 1:2:3.

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Look at this series: 83, 73, 93, 63, __, 93, 43, ...

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In a party every person shakes hands with every other person.

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There is a 20% chance Sandy will visit China this year, while there is a 60% chance that she will visit Malaysia this year.

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John traveled 80% of the way from Yellow-town to Green-fields by train at an average speed of 80 miles per hour.

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A copy machine, working at a constant rate, makes 25 copies per minute.

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