Math practice for 13 year olds - page 9 of 421
Number of problems found: 8407
- The river
The river flows at 4 km/h. A boat can go downstream thrice as fast as upstream. Find the speed of the boat in still water. - A tradesman
A tradesman marks his goods at 35% above the cost price and then allows a discount of 15%. Find his profit percentage. - Two vertically
Two vertically opposite angles are (x-20)° and 85°; then, find the value of x. - An examination
In an examination there were 1000 boys and 800 girls. 60% of the boys and 50% of the girls passed. Find the percent of candidates failed. - The profit 4
By selling an article for 19.25 USD a trader makes a profit of 25% How much must he sell the article to make a profit of 40 %? - Joseph 2
Joseph visits the club on every fifth day, Harry visits on every 24th day, and Susan visits on every ninth day. If all three of them met at the club on a Sunday, then on which day will they meet again? - Central angle 2
What is the arc length of a circle with a radius of 12 cm and a central angle of 255 degrees? A. 8.5 cm B. 12π cm C. 24π cm D. 17π cm - The cuboid 2
If the areas of three adjacent faces of a cuboid are 6,10,22 respectively then find the volume of the cuboid. - A lettuce
At Alan’s Produce, all produce is 20% off on Tuesdays. If a head of lettuce is normally $2.50, how much would it cost on Tuesday? - Von went
Von went to a mall to buy some things for his school projects. He spent 5/8 of his money in a bookstore and 1/5 of the remainder in a grocery store. If he spent P120 in the grocery store, how much money did he have at the start? How much money did he have - Train stops
Without stoppages, the speed of a train is 150 km/h and with stoppages, it is 100 km/h. How many minutes, does the train stop? Solve for distance 300 km. - One hour
If a pipe can fill a tank in 5 h and another pipe can empty the tank in 10 h, if both pipes are opened simultaneously, how many parts are filled in 1 hour? - A shopkeeper 6
A shopkeeper allows 40% discount on the marked price and there is a loss of 30%. Find the profit percent if it is sold at the marked price. - Ann and Susan
The difference between the present ages of Ann and Susan is 6 years. After 4 years ratio will be 3:4. What can be the present age of Susan? - A period
A period of 4 hrs 30 min is what percent of a day? - The tea
If the price of tea is increased by 20%, by how much percent must the consumption of tea be diminished so as not to increased the expenditure? - Workers
If x men can complete a work in 8 days and x+4 men can complete the same work in 6 days. Find the value of x. - Two articles A shopkeeper bought two articles each at Rs.800. There was 25% profit on one and 25% loss on the other. Find the total percentage profit or loss in the whole transaction.
- The tent 3
The top of a 1.3 meters tall tent is tethered to the ground by a cable. The cable makes a 37 degrees angle with the ground. Find the cable length. - A discount 2
A discount of 52.50 dollars is obtained if a discount of 15% is allowed. Find the marked price and the selling price.
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