Question

jimhas 100 cards. there is a whole number from 1 to 100 on each card . nocards have the same number. Jim puts a Star on every card that has a multiple of 3 on it. he puts a circle on every card that has a multiple of 7 on it. what numbers are on the cards that have both a Star and a circle on them? the final line of your answer must list only these numbers.​

Answer 1

21, 42, 63, 84.

Explanation:

The cards with a star and a circle must be multiples of 3 and 7.

So these must also be multiples of 21:

These are 21, 42, 63 and 84.