Question

How many numbers between 20 and 99 are equal to 6 times an integer?

a. 3
b. 13
c. 16
d. 17

Answer 1

13

Answer 2

This is equivalent to asking how many multiples of 6 are between 20 and 99. The first multiple of 6 between 20 and 99 is 24, and the last is 96. Take the difference, divide by 6 and add 1.

Answer 3

@whpalmer4 why add 1?

Answer 4

because you have taken the difference, one term is excluded while taking the difference
like for example, in 1 to 99, we know there are 99 terms, but difference = 99-1 = 98

Answer 5

ohh thankyou :)