CLASS 8
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Q. A bicycle is sold for $180 after a 10% discount. What was the original price?
Q. A car is bought for $20,000 and sold for $25,000. What is the percentage profit?
Q. A car travels 120 km in 2 hours. How far will it travel in 5 hours at the same speed?
Q. A certain fungus grows at a rate of 25% per day. If the initial weight of the fungus is 200 grams, what will be its weight after 4 days?
Q. A certain type of yeast ferments sugar at a rate of 10 grams per hour. How much sugar will be fermented in 8 hours?
Q. A child is 10 years old. If they grow 2 years older every year, how old will they be in 5 years?
Q. A child is 9 years old and will celebrate their birthday in 3 months. How old will they be in 1 year?
Q. A company recycles 300 kg of plastic waste. If 25% of it is used to make new products, how much plastic is used?
Q. A cone has a base radius of 2 cm and a height of 6 cm. What is its volume?
Q. A conservation area is 60% forest and 40% grassland. If the total area is 500 acres, how many acres are forest?
Q. A conservation program aims to plant 500 trees each year. If they have already planted 1200 trees, how many more years will it take to reach a goal of 3000 trees?
Q. A conservationist is studying a population of turtles. If the population doubles every 3 years and starts with 20 turtles, how many turtles will there be after 9 years?
Q. A cube has a side length of 4 cm. What is the volume of the cube?
Q. A factory produces 1200 kg of plastic per day. How much plastic will it produce in 15 days?
Q. A farmer harvested 3000 kg of potatoes from 1.5 hectares. What is the harvest per hectare?
Q. A farmer has 10 acres of land and decides to plant soybeans on 60% of it. How many acres will be planted with soybeans?
Q. A farmer sells his produce at $2.00 per kg. If he sells 250 kg, how much money does he make?
Q. A farmer uses 200 kg of fertilizer for 5 acres of land. How much fertilizer is used per acre?
Q. A field has a length of 100 meters and a width of 50 meters. If the farmer wants to plant rice in the entire field, how many square meters of land will be used?
Q. A group of friends are aged 11, 12, 13, and 14. What is the average age of the group?
Q. A jacket is marked at $80 and sold for $64. What is the percentage discount given?
Q. A lab has 3 types of bacteria. If the ratio of type A to type B to type C is 2:3:5 and the total number of bacteria is 100, how many of type B are there?
Q. A national park has 2500 acres of land. If 30% of it is designated for wildlife conservation, how many acres are left for recreational use?
Q. A number is increased by 20% and then decreased by 20%. What is the net change in the number?
Q. A person is 14 years old. If they were born in 2009, what year is it now?
Q. A petri dish contains 200 bacteria. If 10% die every hour, how many bacteria will remain after 3 hours?
Q. A plastic bottle weighs 20 grams. If a factory produces 1500 bottles in a day, what is the total weight of the bottles produced in grams?
Q. A plastic container costs $2.50 each. If a retailer buys 100 containers, what is the total cost?
Q. A plastic product is sold for $15. If the production cost is $10, what is the profit percentage?
Q. A product is marked at $200 and is sold at a 15% discount. What is the selling price?