Math practice for 13 year olds - page 2 of 365
Number of problems found: 7285
- Two friends 5
Two friends, X and Y. X is 36 years old and Y is 16 years. In how many years X will be twice as old as Y? - Subtracting 7
Subtracting 50 from 50% of a number we get 50 as remainder. Find the number. - Rhombus = area, diagonal
The area of a rhombus is 144 sq cm. One of its diagonals is twice the other. How long is the shorter diagonal? - Train station
A man walks from his house to station. If he walks at 5 km/h he misses a train by 7 minutes. However, if he walks at 6 km/h, he reaches the station 5 minutes before the departure of the train. Find the distance covered by him to reach the station.
- 128 USD
128 USD is increased by 20 percentage. Determine the new amount. - Doubling - simple interest A sum becomes its double in 10 years. Find the annual rate of simple interest
- Surface = volume
If the volume and the surface area of a sphere are numerically the same then find its radius. - The radius 4
The radius of a sphere is r=9 cm. What is the volume of this sphere? Use π ≈ 3.14 and round your answer to the nearest hundredth. cubic millimeters - Collecting money Rs 180 contained in a box of one rupee, 50 Paise and 25 Paise coins in the ratio 2:3:4. What is the number of 50 Paise coins? (One rupee = 100 paisa)
- Working group 20 men complete one-third of a piece of work in 20 days. How many more men should be employed to finish the rest of the work in 25 more days?
- 4100 USD 4100 USD was distributed in 50 boys and girls. Each boy got $ 90 and each girl $ 65. Then, find the number of boys.
- Somebody Somebody spend 5% of his wages on paying school fees. That is 800 shillings . How much does he earn?
- By selling 2
By selling 100 pens, a shopkeeper gains the selling price of 20 pens. Find his gain percent. - 5 yrs 5 yrs ago, the average age of Rasmi and Suravi was 20 yr. Now, the average age of Rasmi, Suravi and Mita is 30 yrs. What will be the age of Mita after 15 years?
- Quarter of 60 grams
For a science experiment, students need to find 25% of 60 grams. John says " I can find this by calculation 1/4 of 60" Andre says: 25% of 60 means 25/100 times 60. Do you agree with either of them? Show your reasoning - Inverse percentages
If a is 40 percent of b then, what percent is b of a? - A baseball
A baseball is hit over the 325 foot fence, which is 110 feet tall. How far did the ball carry on a straight line when it reached the fence? - Fund raising A number of persons decided to raise 3 millions euros by equal contributions from each. Had they contributed 50 euros each extra, the contribution would have been 3.25 millions euros . How many persons are there?
- Price of rice
The price of rice is reduced by 5% . How many kilograms of rice can now be bought for the money which was sufficient to buy 50 kg of rice earlier?
A fruit vendor was able to sell 85% of his 80 kilograms of bananas. How many kilograms of bananas were sold?Do you have homework that you need help solving? Ask a question, and we will try to solve it. Solving math problems.
