Maths practice for 14 year olds - page 65 of 378
Number of problems found: 7551
- Sweaters 80695
Out of 400 sweaters, 5% are second quality, and the rest are first quality. How many sweaters are of first and second quality? - Single-digit 80674
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 - Grandchildren 80639
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? - Calculate 80636
Calculate the distance of a chord 19 cm long from the center of a circle with a diameter of 28 cm. - Two-thirds 80635
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. - Acceleration 80626 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?
- Participated 80621
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 - Difference 80618
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? - Characteristics: 80608
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 - Resistance 80606
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. - Resistances 80604 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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