# Examples for 8th grade

#### Number of problems found: 3576

- Pipe thickness

The outer circumference of the tube is 32cm. Its length is 60cm, density 8.5g/cm ^ 3 and weight 9.495kg. Calculate the wall thickness of the pipe. - Iso triangle

An isosceles triangle with a base of 8 cm. Its circumference is 28 cm. Calculate the height of the triangle. - Rocks

Dana loves rocks! She has 6 pieces of granite, 3 pieces of marble, 14 pieces of sandstone, and 1 piece of slate. What is the ratio of pieces of sandstone to pieces of marble in Dana's collection? - Salaries

The employer increased the salaries of its three employees by an average of 30 euros. One increased his salary by € 20, the other by € 45. How many euros did he raise the salary of a third employee? - Create 2

Create word problems based on the given number sentence (300/24) - (207.60/24) = N - A turtle 2

A turtle can walk 1/12 of a kilometer in an hour. The turtle is 1/5 of a kilometer away from a pond. At this speed, how long will it take the turtle to reach the pond? - Two companies

The two companies made a work together in 100 days. The first company would do it in 150 days, how many days would the work take the second company? - Find the

Find the volume and surface of a prism with a height of 120 mm, the base of which is an right isosceles triangle with a leg length of 5 cm. - Sphere volume formula

If V=4/3 π r^{3}, find, the value of V when r = 7, the value of r when V=113 1/7 - Bronze

How many kg of tin is in 3.6 kg of bronze if it contains 15% tin? - Manganese

Manganese bronze contains the following amounts of metals per pound: copper 0.89 lb, tin 0.10 lb, and manganese 0.01 lb. How much copper is in a shaft that weighs 235 pounds? - Chemical drum

A cylinder chemical drum is 220.5cm long and the radius of the drum is 42cm. Calculate the cost of painting the drum at the rate of RS.0.15/cm². - Face combinations

If I have 20 sets of eyes, 20 noses, and 20 mouths, how many unique face combinations can I make? - The diagonals

The diagonals in the diamond ABCD are 6 cm and 8 cm long. What is the perimeter of this diamond? - Multiple ratio

The numbers of boy students, girl students, teachers and other staff of the school are in the ratio 14: 12: 2: 1. How many teachers are there at school if there are 216 girl students at school? - Plants

The number of germinated plants increased by 50% to 300 from morning to evening. How many plants were germinated in the morning? - After the discount

The dishwasher costs 210 EUR after the discount. How much did it cost before the discount if the new price is 90% of the original price? - Two brothers

The two brothers have a total of 48 nuts. Two thirds of the nuts of the first correspond to 2/5 of the number of nuts of the second. How many nuts does everyone have? - Raindrops

The car runs on a horizontal track at a constant speed of 20 m^{2}-1. It is raining. Raindrops fall in a vertical direction at a speed of 6 m/s. a) How fast is the speed of the drops relative to the car windows? b) What is the angle of the raindro - Saving account

After a year, bank added 54 euros to Mr Eva saving account. The interest rate on her saving account is 1.25% p. a. How many euros did Mrs. Eva have on her account a year ago?

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