Grandchildren 33491

Grandma is 72 years old. It's four times the sum of the ages of her two grandchildren. The age of the older of them is twice of a younger grandson. How old is your younger grandson?

Correct answer:

a =  6

Step-by-step explanation:

72=4 (a+b) b=2 a  4a+4b=72 2ab=0  Row242 Row1Row2 4a+4b=72 3b=36  b=336=12 a=4724b=4724 12=6  a=6 b=12

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