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Grouping Goodies

Stage: 1 Challenge Level: Challenge Level:3 Challenge Level:3 Challenge Level:3

Pat has no more than $20$ sweets in a bag.

seets

She counts her sweets in groups of two. She has one left over.

Then she counts her sweets in groups of five. She has $2$ left over.

How many sweets could Pat have? Is there another answer?