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

If x,y ,and z are positive real numbers such that x+y-z =50 , y-z+x =60 , and z-x+y = 80, then find the z value?

At what approximate time between 4 and 5 am will the hands of a clock be at right angle?

A can do a piece of work in 90 days & Y can do it in 80 days.

The speed of a car is 90 km in the first hour and 30 km in the second hour.

Two persons start at the same point, walk in opposite directions with 7 km/hr and 4.5 km/hr respectively.

John can complete a given task in 20 days.

1, 5, 13, 25, 41, ?

B and C start a business with Rs.2000 and Rs.10000 respectively.

A merchant marks his goods up in such a way that the profit made on selling 30 articles is equal to the cost price of 20 articles.

A dog takes 3 leaps for every 5 leaps of a hare.

5 z – 3 < 3 z + 4, which of the following cannot be a value of z3z3 ?

What percent of a week is 3 days?

The price of lunch for 14 people was $207 including a 15% gratuity for service.

A certain number of machines can do a work in 75 days.

A and B walk around a circular track.

Diesel costs Rs.4per lit and petrol costs 5.63 per litre.

The average of first seven multiples of 5 is:

The ratio of the present ages of a man and his wife is 6 : 5.

The average height of 40 girls out of a class of 50 is 169 cm. and that of the remaining girls is 167 cm.

If 10 is added to thrice a number and this sum is multiplied by 5, the result is the same as if the number is multiplied by 5 and 13 is added to the product.

Six dots are evenly spaced on the circumference of a circle.

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If x = 1- 4t and y = 2t - 2, then for what value of t does x = y?

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The salary of a worker is first increased by 40% and afterwards reduced by 40%.

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A man complete a journey in 1010 hours.

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