Aliraza001
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?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
1/3 , 1/4, 1/5, 1/7 of a human population island X
Therefore the population at island X must be a multiple of 3,4,5,7 = least common multiple as 420.
Constraint given population is less than 5000. A multiple of 420 less than 5000 is 420*12= 4620.
One third of 4620 = 1540
One fourth of 4620 = 1155
One fifth of 4620 = 924
And one seventh of 4620 = 660
Adding 1540+1155+924+660 = 4279
Option B