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In a science laboratory, Eva had 3 bottles labelled P, Q and R with some acid in each one of them. At first, she transferred `1/9` of the acid from P to Q. Next, she transferred `1/9` of the acid from Q to R. Finally, she transferred `1/9` of the acid from R to P. In the end, each of the bottles P, Q and R had 400 ml of acid in them. ...
Jug X, Y and Z each contained some water. Maggie transferred `1/4` of the water from jug X into jug Y, then poured `1/4` of the water from jug Y into jug Z, and finally transferred `1/4` of the water from jug Z to jug X. Now, there are 9 litres of water in each jug. Find the amount of water in each jug at first. Notes to student: ...
Farmer Tom had a certain number of animals on his farm. 15% of the animals were pigs and the rest were cows. 60 cows and 20 pigs were taken away for vaccination. The ratio of the number of remaining pigs to cows became 1:7. Find the total number of animals that the farmer had in the beginning.
There were a certain number of participants in a yoga class. 10% of the participants were women and the remaining participants were men. After a short while, 23 men and 7 women left the class. The number of remaining men became 11 times of the number of remaining women. Find the total number of participants in the yoga class at first.
In a marathon race, 70% of the runners were Kenyans and the rest were Jamaicans. 24 Kenyans and 16 Jamaicans dropped out after the first 10 km of the race. The ratio of the remaining Jamaican runners to Kenyan runners became 2:5. How many runners took part in the marathon?