Math practice for 13 year olds - page 88 of 414

Number of problems found: 8262

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?
James 6
James and Lisa shared some sweets. James took 2/7 of the sweets, and Lisa took the rest. If James took 18 fewer sweets than Lisa, how many sweets did they have altogether at first?
How many 28
How many can 15 cm x 25 cm tiles fit in a room with a length of 3 m and a width of 2.5 m?
Chicken average weight
A poultry company received a thousand chickens with an average weight of 1.7 kg at CZK 50/kg. During the day, the company sold 300 chickens for 24 thousand. CZK. What was the average weight of unsold chickens?
Resistor parallel connection
Three identical resistors connected in series have a total resistance of 9 ohms. What will be their total resistance when connected in parallel
Triangle field area
The field has the shape of an equilateral triangle. Calculate its area if you know that the side is 280 meters long.
Dream market equivalence
At the dream market, she offered the Sphinx to a traveler for four dreams, seven illusions, two naps, and one nightmare. Another has seven dreams, four illusions, four naps, and two nightmares. The Sphinx always measures the same for all travelers. How ma

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