John has 3 children. He and his wife are supposed to buy notebooks for their sons but they couldn't agree on how many to buy. So John bought 2 notebooks for each of his children and John's wife bought 5 notebooks for each of them. How many notebooks did they buy in total for their children?
John bought 2 notebooks for his 3 children: 2 notebooks/child x 3 children = 6 notebooks. The father bought 6 notebooks.
John's wife bought 5 notebooks for their three children: 5 notebooks/child x 3 children = <<5*3=15>>15 notebooks. The mother bought 15 notebooks.
Now, the total number of notebooks is 6 notebooks +15 notebooks = <<6+15=21>>21 notebooks.
#### 21