A group of boys and girls planted a total of 148 trees. Each boy planted 7 trees, and each girl planted 5 trees. There were 4 more boys than girls in the group. How many boys were there in the group? 1. Identify the unknown quantity that you are required to find in the problem.
2. Use a letter (e. g. x) to represent the unknown quantity.
3. Express other quantities in terms of the letter that represents the unknown quantity. In this case, express each of the following in terms of x.
(a) the number of girls
(b) the number of trees planted by all the boys
(c) the number of trees planted by all the girls