Question 16: How many natural numbers x know x ⋮ 5; x ⋮ 6 and 0 < x < 100.

A. 1

B. 2

C. 5

D. 3

Do x ⋮ 5; x ⋮ 6 ⇒ x ∈ BC(5;6) = {0;30;60;90;120;…}

Which 0 < x < 100, so x ∈ {30;60;90}.

So x {30;60;90}

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