The grandson is 9 years old.
This would mean that the grandpa is 54.
9x6=54
54/6=9
there are 5 solutions. Or 4
14 volunteers will not be able to help.
Step-by-step explanation:
According to given statement;
One booth requires 3 Volunteers.
No. of booths = 16
Given number of volunteers = 62
We will multiply total number of booths with 3 to find the number of volunteers required.
Volunteers required = No. of booths x 3
Volunteers required = 
Volunteers required = 48
Subtract the required volunteers from total volunteers;

14 volunteers will not be able to help.
Keywords: Subtraction, Multiplication.
Learn more about subtraction at:
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Red is the positive integers and blue is the negative integer.