Math practice for 13 year olds - page 86 of 428

Number of problems found: 8558

Car speed average
The car traveled the first third of the track with a constant speed of v1, the next two-thirds of the way at a constant speed of v2=72km/h, and the average speed of v=36km/h. Find v1.
Coffee weight price
Half a kg of coffee costs CZK 124. Calculate how many crowns you will pay for 3/4 kg of this coffee.
Hexagon circle radius
A regular hexagon is described and inscribed in a circle. The difference between its areas is 8√3. Find the circle's radius.
Roland
Roland repairs and sells broken furniture. He pays $300 for a gaming chair and sells it for $408. What is his percent markup?
Inflated
By the time a man decided to buy a house, the cost had inflated by around 8% to £182,000. What was the approximate price before inflation?
Tristan
Tristan normally wrestles at 80 pounds. He wants to add enough weight to move into the 84-pound division. What percent of his current body weight must he add?
Resistor parallel total
How much resistance must be connected in parallel with the 1-ohm resistor to make the total resistance 0.6 ohm?
A charge
A charge of 9 C passes through series-connected resistors with resistances of 40 ohms and 60 ohms in 1 minute. a) What voltage are they connected to? b) Calculate the voltage across each resistor.
Resistor series voltage
Resistors with resistances of 6 ohms and 10 ohms are connected in series to a voltage of 24 V. a) How much current passes through them? b) What are the voltages on the individual resistors?
If four
If four friends evenly split 6 1/2 pounds of candy, how many pounds of candy does each friend get?
Hakeem
Hakeem subtracted 8 from a number, then multiplied the difference by 4/5. The result was 20. Write and solve an equation to find the number, x.
A dress
A dress regularly sells for $75. The sale price is $58. Find the percent decrease in the sale price from the regular price.
Three 220
Three numbers are in a ratio of 2:3:4. Find the second number if their sum is 306. a. 68 b. 102 c. 136 d. 140
Sarah 3
Sarah ran 4 7/8 miles, then walked 1 11/12 miles. Could you find the total distance she traveled?
Square room 2
A square room has a floor area of 144 square feet. The height of the room is 6 feet. What is the area of one wall?
Function graph intercepts
Draw the graph of the function y = -2x + 3. Calculate the coordinates of the intersections of the function's graph with the x and y axes.
Addition consecutive numbers
Each of the three additions is 5 more than the previous one. The sum of all is 78. Which numbers are these?
Small and big box
Boxes with dimensions of 6 cm, 10 cm, and 15 cm should fit into a cube-shaped box. What are the smallest dimensions a box can have? How many boxes of the given dimensions can fit in it?
Percentage comparison paradox
Can it be 1%>2%? Can't it be nonsense and a denial of the law of mathematics, yet 119 out of 120 people say so?
A shopkeeper 5
A shopkeeper sold some sets of Pencils and Pens. Each set contained 6 pencils and 2 pens. If the shopkeeper sold 112 pencils and pens, how many pens did she sell altogether?

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