CLASS 8
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Q. If a certain virus has a reproduction rate of 50% every hour, how many viruses will there be after 3 hours if you start with 10 viruses?
Q. If a child is 7 years old now, how many years will they be when they reach 10?
Q. If a crop requires 300 liters of water per week and the farmer has 5 crops, how much water is needed in total per week?
Q. If a cube's volume is 27 cm³, what is the length of one side?
Q. If a culture of bacteria grows from 500 to 2000 in 6 hours, what is the average growth rate per hour?
Q. If a cylinder has a radius of 3 cm and a height of 5 cm, what is its volume?
Q. If a farmer produces 1200 kg of wheat from 2 hectares of land, what is the yield per hectare?
Q. If a farmer wants to increase his yield by 20% and his current yield is 800 kg per hectare, what will be his new yield?
Q. If a farmer's land produces 500 kg of barley per hectare and he has 3 hectares, how much barley does he produce in total?
Q. If a forest area is reduced by 20% and the remaining area is 800 hectares, what was the original area of the forest?
Q. If a graph has 12 edges and 8 vertices, what is the maximum possible degree of any vertex?
Q. If a graph has 4 vertices and each vertex is connected to every other vertex, what is the degree of each vertex?
Q. If a graph has 8 vertices and 12 edges, what is the average degree of the vertices?
Q. If a metal has a density of 8.96 g/cm³ and a volume of 10 cm³, what is its mass?
Q. If a number is divided by 6, the remainder is 4. What is the remainder when the same number is divided by 3?
Q. If a number is tripled and then decreased by 5, the result is 16. What is the number?
Q. If a person earns $5000 and spends 60% of it, how much does he save?
Q. If a person is 16 years old now, how many years will they be when they turn 20?
Q. If a person is currently 12 years old, how many years will it take for them to reach 18 years of age?
Q. If a person saves 25% of his income and spends the rest, what fraction of his income does he spend?
Q. If a person spends 30% of his salary on rent and 20% on groceries, what percentage of his salary is left?
Q. If a piece of metal weighs 200 grams in air and 150 grams in water, what is the buoyant force acting on it?
Q. If a single bacterium divides every 20 minutes, how many bacteria will there be after 2 hours starting from 1 bacterium?
Q. If a synthetic fiber can stretch up to 5 times its original length, what is the maximum length of a 2-meter fiber?
Q. If a synthetic fiber is 30% lighter than cotton, and a cotton fiber weighs 200 grams, how much does the synthetic fiber weigh?
Q. If a synthetic fiber is produced at a rate of 500 kg per hour, how much fiber will be produced in 8 hours?
Q. If a teenager is 15 years old now, how many years ago were they 10 years old?
Q. If a teenager is currently 13 years old, how many years until they reach 18?
Q. If a train travels 60 km in 1 hour, how far will it travel in 3.5 hours?
Q. If a trapezium has bases of lengths 10 cm and 6 cm, and the height is 5 cm, what is the area of the trapezium?