Maths practice for 14 year olds - page 92 of 361
Number of problems found: 7217
- Skater equipment options
Mike is buying skater equipment. He chooses one of 2 helmets, one of 3 pairs of gloves, one of 4 knee pads, and one of 2 elbow pads. How many different combinations of equipment can he choose? - Mobile phone settings
Lucia's mobile phone offers a choice of 10 ringtones, seven tones when receiving an SMS, and 15 wallpapers in the background of the display. How many ways can Lucia set up her mobile? - Teacher 3 Teacher Ken is interested in buying a jacket at a discounted price. The price tag says the original price is Php 1250, which is 20% off. What would be his change if he gave the cashier Php 1000?
- The price 3
The price of a notebook is 20 percent less than that of a book. By what percent is the book's price higher than the price of the notebook? - Swing balance lever
Two children with different weights sit on the swing, a lever with your shoulders. On the left side sits a child with a capacity of 30 kg, and on the right, a child with a capacity of 20 kg. One swing arm is 150 cm long. How would you seat the children so - Team creation options
The teacher wants to create one three-member team from four girls and four boys, with one girl and two boys on the team. How many different ways can the teacher form the team? - Grandmother currant harvest
The grandmother and granddaughter Julia harvest currants in 15 hours of work together. Julia would harvest currants for ten days after 6 hours of work a day. a) Determine in hours how long the harvest would have taken for her grandmother if Julča had not - Magnifying glass percentage
What magnification of magnifying glass in percent if the magnification is 4x? - PC price increase
The new type of PC became 15% more expensive before Christmas and is now being sold for CZK 13,800, which is 80% of the pre-Christmas (already higher) price. What was the original price of the PC before the price increase? - Cone roof consumption
The roof of a tower has the shape of a lateral surface of a cone with a base diameter of 4.3 m. The angle between the slant side and the base plane is 36°. Calculate the amount of sheet metal needed to cover the roof, allowing 8% for waste. - Spherical layer
What is the volume of the spherical layer that remains after cutting the paragraphs on both sides of the ball, whose height is 3.5 cm? Is the diameter of the ball 24 cm? - Pump power
Determine the pump power if: I pour 3 m³ of water from the tank in 120 seconds with a hose. The height of the hose mouth above the tank is 1.5 m. The water's speed from the hose outlet is 20 m/s. - Triangle line ratio
The line p passes through the center of gravity T of the triangle and is parallel to the line BC. What is the ratio of the area of the divided smaller part of the triangle by the line p? What is the area of the triangle? - Fraction and ratios
Fraction and ratios are different names for the same thing. - Miloš 2
Miloš works in an optician's. He helps his friend Martin with the selection of lenses for prescription glasses. These can have: - a special anti-scratch treatment, - anti-reflection – ensures greater permeability of light into the eye, - photochromic – da - TV screen width
The diagonal of the TV screen is 82 cm, and the height is 40 cm. Calculate the width of the screen. - Aircraft engine work
The aircraft weighs 61 tons. It climbed from a height of 1000 m to a height of 3000 m while increasing the speed from 170 m/s to 210 m/s. What work did the aircraft engines do? - Sarrah
Sarrah bought cupcakes for her family. Thirty-six cupcakes are chocolate, and the rest are red velvet. If 80% of all the cupcakes she bought are chocolate, how many red velvet cupcakes did she buy? - Pavement around the house
The pavement around the Vyberar family's house has two parts with a total length of 19 metres. The longer part of the pavement is 1 metre shorter than three times the length of the shorter part of the pavement. Decide for each of the following statements - Friends' meeting
Friends Jenda and Martin live 13 kilometres apart. Jenda went to Martin by bicycle at an average speed of 18 km/h, and Martin at the same moment set out to meet him on a scooter. Half an hour after setting off, they met. a) Calculate in kilometres per hou
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