QA – Placement Quizzes | Number Divisibility | Question 1

You have to select such 2 digit numbers that are either perfectly divisible by 5 or 9. Find the count of such numbers.

(A)

20

(B)

28

(C)

30

(D)

25

Answer: (B)

Explanation:

count of all the numbers that are divisible by 5 are : 95/5 = 19

count of all the numbers that are divisible by 9 are : 99/9 = 11

count of all the numbers that are divisible by 45 are : 90/45 = 2

total  = 19 + 11 – 2 = 28 

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