Math practice for 13 year olds - page 88 of 428
Number of problems found: 8558
- Bookshop
Ali went to a bookshop. He spent 3/5 of his money on books and 1/4 of it on a pen. What fraction of his money did he spend altogether? What fraction of his money did he have left? - Home is home
At 65km/h, Alfred can reach home in 50 minutes. At what speed should he drive his car so that he can reach home 10 minutes earlier? - Reciprocal 13
What is the product of 5 2/3 and its reciprocal? - Residents
In a college dormitory, 1/10 of the residents are juniors, and 2/5 of the residents are sophomores. What fraction of the students at the dormitory are juniors and sophomores? - Musa worked
Musa worked for 44 hours during one five days a week. His hours are from Monday through Thursday: 3 3/4, 6 7/12, 11 5/16, and 6 5/6. Calculate the number of hours he worked on Friday. - Quotient of two fractions
If the quotient of 8/9 and 1/3 is subtracted from the product of 2 3/4 and 1 3/5, what is the difference? Write the solution as a mixed number or a fraction in the lowest terms. - For what
For what value of x is -5x+8=-6 a true statement? Write your answer as a decimal. - Chessboard square selection
How many ways can one white and one black square be selected on an 8x8 chessboard if the selected squares cannot lie in the same row or column? - Wheat flour grinding
75 kg of flour is ground from 100 kilograms of wheat. How much wheat is needed to obtain 135 kg of flour? - Paper tree saving
People must collect twenty-five tons of waste paper to save 160 trees. How many kilograms of paper must be collected to save 32 trees? - Cake 9
1/3 of a cake costs 3$ and 50 cents. Then how much does the whole cake cost? - Shani
Shani mixed 1 1/3 cups peanuts, 1 3/4 cups raisins, and 1 1/2 cups chocolate chips to make a trail mix. How many cups of trail mix did she make? Responses - Osmium wire
A spiral of osmium wire has a resistance of 300 ohms at a temperature of 20 degrees Celsius. To what temperature was the coil heated if its resistance rose to 2940 ohms? (alpha=4*10-3 1/K) - Aluminum resistance temperature
An aluminum wire has a resistance of 4.25 ohms at 0 degrees. Determine its resistance at a temperature of 200 degrees Celsius. The temperature coefficient of the electrical resistance of aluminum is 4.4·10-3 1/K. - Tractor friction work
A tractor pulls a tree trunk weighing 1.5 t for a distance of 2 km along a horizontal road at a constant speed. What mechanical work does it do if the coefficient of sliding friction is 0.6? - Platinum temperature coefficient
The resistance of a platinum wire at a temperature of 20°C is 20 Ω, and when heated to 500°C, it increases to 59 Ω. Determine the mean temperature coefficient of platinum - Coil resistance temperature
A copper wire coil winding has a resistance of 10 Ω at a temperature of 14°C. The passing current by the coil heats up, and its resistance increases to 12.2 Ω. To what temperature did the coil winding heat up? α = 3.92 * 10-3 1/K. - Two tariffs
You pay $20 and $0.05 per minute, and somebody else spends $15 and $0.25 per minute. How long would it take for both of you to spend the same amount? - Centimeters to inches
How many inches are there in 70.32 centimeters when 1 inch equals 2.54 centimeters? Round off your answer to the nearest thousandth place. - Absolute value expression
Calculate: |7 − 15| + |8| − |−13| − 1 =
Do you have homework that you need help solving? Ask a question, and we will try to solve it. Solving math problems.
