Counting and Combinations in Mathematics

The video tutorial explains how to determine the number of boys and girls in a bookstore by finding combinations of numbers that add up to 11. It then narrows down the combinations by identifying those with a difference of 3 between the numbers. The solution reveals there are seven boys and four girls, with three more boys than girls.

What is the first step in finding the number of boys and girls in the bookstore?

• Counting the number of girls

• Counting the number of boys

• Finding the difference between boys and girls

• Finding all combinations that sum to 11

Which of the following is a valid combination that sums to 11?

• 2 + 6

• 3 + 8

• 6 + 4

• 5 + 5

What is the next step after finding all combinations that sum to 11?

• Finding combinations with a difference of 3 between addends

• Counting the number of boys

• Finding combinations with a difference of 2 between addends

• Counting the number of girls

Which combination has a difference of 3 between the addends?

• 1 + 10

• 2 + 9

• 4 + 7

• 3 + 8

How many boys are there in the bookstore?

• 7

• 10

• 3

• 4

How many more boys are there than girls in the bookstore?

• 2

• 3

• 4

• 5