Maths practice for 12-year-olds - page 260 of 359

Number of problems found: 7167

Passenger boat
Two-fifths of the passengers in the passenger boat were boys. 1/3 of them were girls, and the rest were adults. If there were 60 passengers on the ship, how many more boys than adults were there?
Three-digit numbers
How many different three-digit natural numbers can be created so that the digits are different and the last digit is 0?
Cube wall
Calculate the cube's diagonal if you know that one wall's surface equals 36 centimeters square. Please also calculate its volume.
Simple equation 2
Find X in this simple equation: X/9 = 96/108
Mow the lawn
Dan would mow the lawn in 12 hours and Milada in 16 hours. How long will it take the lawn mow together?
Number division
Divide the number into two summands, which are in the given ratio: a) 3, 11:4 b) 5.1 8:9 c) 1 7:3 d) 0.42 1:6
Odd numbers
The sum of four consecutive odd numbers is 1048. Find those numbers.
Testing
Students in high school have 10 points for each good-solved task. Five points deduct the wrong answer. After solving 20 tasks, student Michael had 80 points. How many tasks did he solve correctly, and how many were wrong?
How old
The student who asked how many years he answered: "After ten years, I will be twice as old as I was four years ago. How old is the student?
Cars 6
At 9:00 AM, two cars started from the same town and traveled at a rate of 35 miles per hour, and the other car traveled at a speed of 40 miles per hour. After how many hours will the cars be 30 miles apart?
Boys and girls 2
The ratio of boys to girls in the math club is 4:3 . After eight more girls join the club, the ratio becomes 1:1. How many members are there in the club now?
Money 6
Lita had some money. She spent 1/2 of it on a handbag and 1/3 of the remainder on the blouse. She had 260.00. How much money did she have at the start?
Two cuboids
Find the volume of the cuboidal box with one edge: a) 1.4m and b) 2.1 dm.
Bathroom 2
A bathroom is 2.4 meters long and 1.8 meters wide. How many square tiles, 1 dm on each side, will be used to cover it?
Pipe cross section
The pipe has an outside diameter of 1100 mm, and the pipe wall is 100 mm thick. Calculate the cross-section of this pipe.
Classroom chairs
A school has m classrooms. Ten of the classrooms have 36 chairs each, and the remaining classrooms have 34 chairs each. Write a formula to calculate the total number of chairs in the school. Calculate for m = @m.
Unknown number 24
If we add 20, we get 50% of its triple. What is this unknown number?
Parcel 4
Send a parcel by messenger within city limits costs 60 cents for the first pound and 48 cents for each additional pound. What is the cost, in cents, of sending a parcel weighing p=4 pounds?
Mail train
The speed of the mail train is 1370 meters per minute. Express it in miles per hour, correct to three significant figures. Use the following facts to convert this units: 1 meter = 39.37 inches, 1 mile = 1609 m, 1 hour = 60 minutes
Calories
A large order of McDonald's french fries has 500 calories. Of this total, 220 calories are from fat. Find the ratio of the calories from fat to total calories in a large order of McDonald's french fries.

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