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)
26
(C)
30
(D)
25
Answer: (B)
Explanation:
Numbers divisible by 5: There are 18 numbers (10, 15, 20, …, 95).
Numbers divisible by 9: There are 10 numbers (18, 27, …, 99).
Numbers divisible by both 5 and 9 (multiples of 45): 45, 90.
Total count = Numbers divisible by 5 + Numbers divisible by 9 – Numbers divisible by both Total count = 18 + 10 – 2 = 26
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