Maths practice for 14 year olds - page 68 of 376

Number of problems found: 7507

Sweater quality percentage
Out of 400 sweaters, 5% are second quality, and the rest are first quality. How many sweaters are of first and second quality?
Farm animal legs
There are cows, ducks, and geese on the farm. They have a total of 126 legs. Ducks are 3 more than houses. And there are 20 cows. If we count all the animals, we have to divide them by the number three, and we should get a single-digit number.
Strawberries - shop
Mom and grandma went shopping at the market. Mom bought 2 kg of strawberries and 3 liters of blueberries and paid 250 CZK. Grandma bought 1 kg more strawberries and 0.5 l fewer blueberries than mom and paid 45 CZK more than her. How much did 1 kg of straw
Grandparent age average
The average age of the grandfather, grandmother, and their five grandchildren is 26 years. The average age of the grandchildren themselves is 7 years. Grandma is a year younger than grandpa. How old is grandma?
Chord center distance
Calculate the distance of a chord 19 cm long from the center of a circle with a diameter of 28 cm.
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.
Car braking acceleration
The car stopped at an initial speed of 90 km/h on a track of 62.5 m. What was its acceleration, and how long did it take to brake the car?
Paper collection classes
Three 9th-grade classes participated in the paper collection competition. The company bought 1 kilogram of paper for €0.12, and the school received €174 thanks to their hard work. Calculate how many kg of paper 9A collected if you know that she collected
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?
In the desert
A man wondering in the desert walks 5.7 miles in the direction S 26° W. He then turns 90° and walks 9 miles in the direction N 49° W. At that time, how far is he from his starting point, and what is his bearing from his starting point?
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?
Arithmetic mean deviation
Arithmetic mean xA=40 and standard deviation sx=8 were calculated. Determine from which numbers the student calculated the given characteristics: a) 24 and 56 b) 16 and 64 c) 32 and 48
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?
A light bulb
We want to connect a 2.5 V, 0.3 A light bulb to a flat battery. How much resistance and how do we need to connect to the light bulb?
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.
The ratio 9
The ratio of the present age of Raul and Rohit is 5:7. Four years ago, Rohit age is 12 more than Raul's age. Then find their present age.

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