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Bunuel
How many multiples of 3 are there between 9 and 99 inclusive?

A. 30
B. 31
C. 32
D. 33
E. 34

Asked: How many multiples of 3 are there between 9 and 99 inclusive?

l = 99
a = 9
d =3
n = (99-9)/3 + 1 = 31

IMO B
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Mohammadmo
3,6,...,99
99-3=96
96÷3=32
32+1=33
Option D

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Mohammadmo the question is asking us to find multiples of 3 are there between 9 and 99 inclusive. You have calculated all multiples of 3 between 3 and 99 inclusive. So instead of 3, it would be 9

(99-9)/3+1 = 31......Option B
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Bunuel
How many multiples of 3 are there between 9 and 99 inclusive?

A. 30
B. 31
C. 32
D. 33
E. 34

total integer multiples from 9 to 99 of 3 ; 33-3+1 ; 31
IMO B
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Bunuel
How many multiples of 3 are there between 9 and 99 inclusive?

A. 30
B. 31
C. 32
D. 33
E. 34


The number of multiples of 3 between 9 and 99 inclusive is:

(99 - 9)/3 + 1 = 90/3 + 1 = 31

Answer: B
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99-9 = 90

90/3 = 30

30+1 = 31
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Can anyone provide a more logical explanation to this questions, please? Why these exact calculations are performed? Thank you in advance
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