Math practice for 13 year olds - page 14 of 435
Number of problems found: 8682
- Two discounts 2
A shirt printed with a price of EUR 150 is sold for EUR 105 after two successive discounts. If the second discount is 12.5%, then find the first discount. - Cylinders and cube
How many cylinders of radius 20 cms and height 0.7 metres can be formed by melting a cube of 2.2 metres sides? - An equilateral triangle 2
If the sides of an equilateral triangle are increased by 2 meters, the area is increased by 7√3 square meters. Find the length of the side. - The price 8
The price of a commodity has decreased by 10%. What is the percentage by which it should then be increased to get the original price? - Petrol, fuel
In a car meter shows that it has kept oil 1/5 of its fuel capacity. When 22 liters of petrol is filled the meter went on 3/4 of its capacity. Find the capacity of the car. - Three numbers
In three numbers, the first number is double the second number, and the second number is double the third. The average of the numbers is 21. Find the least number. - A pen 2
A pen cost 1 USD plus half its price. How much does it actually cost?
- HCF and LCM equation
The LCM of two numbers is 20 times their HCF and (LCM+HCF)=2520. If one number is 480, what will be the triple of another number? - Family members
Three years ago, the average age of a family of five members was 27. The present average age is also 27 after a child is included in the family. Find the age of the child. - The rice 2
60 kg of a certain variety of rice at Rs 32 per kg is mixed with 48 kg of another variety of rice, and the mixture is sold at the average price of Rs 28 per kg. If there is no profit or loss due to the new sale price, then find the price of the second var - The expenses
The expenses on rice, fish and oil of a family are in the ratio 12:17:3.The prices of these articles are increased by 20%, 30% and 50% respectively. Find the total increased percent. - Profit sharing
Three people, A, B, and C, started a business by investing Rs. 250000, Rs. 300000, and Rs.350000, respectively. Find the share of B out of an annual profit of Rs.187200. - One half of percent How is 1/2% expressed as a decimal fraction?
- Men at work 8 men can finish a piece of work in 40 days. If 2 more men joined with them, then how many days it will take to complete the work?
- Parallel tracks
Two trains cross each other in 14 seconds when running in opposite directions along parallel tracks. The faster train is 160 m long and crosses a lamp post in 12 seconds. If the speed of the other train is 6 km/hr less than the faster one, its length, in
- Cost price 2 If the cost price of 23 toys is equal to the selling price of 20 toys, find the gain or loss percent.
- Four points
There are 4 nonlinear points. How many triangles can form by joining them? - Diagonals
What is the number of diagonals of a decagon? - Two syrups
There are two pots of mixture of syrup and water having ratios 3:2 & 4:5 respectively. What quantity of solution of 1st pot is to be mixed with 3 litre of 2nd pot to get a new mixture where both syrup and water will be same? - Unknown en I think of a number. If I subtract 9 from it and multiply this difference by 4, the result is 128. Form an equation and solve it to find the number.
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