Should be A.
1⁄3, 1⁄4, 1/5, 1/7 of X needs to be a whole number, in that case the population of X must be a number divisible by 3,4,5 & 7. Now we also know that the population of Y must be a multiple of the same and of all the options only 4200 is divisible by these numbers.
Anik005
One third, one fourth, one fifth and one-seventh of the human population of Island X, which has fewer than 5000 human inhabitants, are all whole numbers and their sum is exactly the population of Island Y. What is the population of Island Y?
A.4200 B.4279 C.4581 D. None of these
Can anyone solve this math in details please