Question

In first 400 natural numbers those divisible by 2 are removed and again those divisible by 5 are also removed. How many of the given numbers will be left now? Select one:
a. 170
b. 150
c. 160
d. 200

Answer 1

Answer:

If you remove numbers divisible by 2 then 200 numbers will left.

Those numbers will end from the unit digit 1,3 ,5 ,7 ,9 .

Now if you remove the numbers divisible by 5 the numbers remaining will be 4/5th of the 200 numbers. 4/5th of 200 is 160. so the answer is (C) 160