Math practice for 13 year olds - page 141 of 415

Number of problems found: 8284

The tailor
The tailor estimated the rest of the fabric in the package at 11 m. By measuring, he found that he could cut the same pieces of this fabric without a residue in 150 cm or 210 cm increments. How many meters of fabric were in the package?
10 workers
Ten workers will perform the assigned work in 8 days. If six workers work for six days and then another six join them, how long will it take to get the job done?
Tandem jump
During the tandem jump, the paratroopers dropped from a height of 1.7 km to a height of 1.5 km above the surface in 4 seconds. At what average speed did they move before the parachute opened?
Rabbits and chicken
There are rabbits and chickens on a farm, 41 heads and 132 legs in all. How many rabbits at the farm?
Earnings 2
Trina's paycheck earnings vary directly from the number of hours she works. If she works 19 hours and earns 187.15 pesos, what should she earn if she works 40 hours?
Treasure map
On a treasure map, actual distances are directly proportional to scaled distances. If 15 miles is represented by 3 centimetres on the map, does 9 centimetres represent 135 miles?
Trapezoid
Right-angled trapezoid ABCD has a right angle at vertex A and sides a, b, c, and d. Calculate its perimeter and area, given a = 25 cm, c = 10 cm, d = 8 cm.
Tunnel
Kubo sits on a train speeding at 108 km/h. At that moment, the train enters the tunnel, which, according to Kub's book, is 2 km long. Kubo notices that the end of the train has left the tunnel 75 seconds later than the locomotive has entered the tunnel. W
Consumption function parameters
Assume that consumption C depends on income y according to the function C = a + by, where a and b are parameters. The slope of this function is 0.8, and c is €50 when Y is €30. Does it apply to the values of parameters a and b?
Calculate
Calculate the height of a tree that casts a shadow 22 m long if you know that at the same time, a pillar 2 m high casts a shadow 3 meters long.
Friends money distribution
The friends shared CZK 2,000. Felix got two-fifths, John two-tenths, Paul one-quarter. How many crowns did Tom get?
Center-symmetric letters
Find out which we can write letters (uppercase) as center-symmetric.
Worker production function
The worker's daily production after t weeks is given by the function Q (t) = 50-2.7-0.4t. What will be its products in five weeks?
Divide in ratio
What is 75 in the ratio of 2:3?
Eq1
When the product of two less than three times a number and four is subtracted from nine times the number, the result is eight more than five times the number. What is the number?
Copper resistance temperature
Does the copper conductor have a resistance of 2.8 Ω at 36 °C? What will be the resistance value after cooling to -22 °C?
Cooker spiral
A current of 4.4 A flows through the spiral of the electric cooker. It is connected to a voltage of 220 V. What is the resistance of the spiral?
Vacation class children
The children talked about how they spent the holidays at school. 2/3 of them were on holiday with their parents. Ten children went to the seaside, which is 5/8 of those who were on vacation. How many children are in the class?
Runner acceleration speed
The runner reaches a speed of 30 km/h after 3 seconds from the start. Determine its acceleration.
Squares
Cut out the square with the integer side from the square with the integer side so that the residual area is 100. What is the longest possible side of the larger square?

Do you have unsolved math question and you need help? Ask a question, and we will try to solve it. We solve math question.