Originally Posted by
symmetry At a school costume party, seven girls wore masks and nine boys did not. If there were 15 boys at the party and 20 students did not wear masks, what was the total number of students at the party?
Create a table, like follows:
Code:
MASKS|~MASKS|TOTAL
BOYS 6 9 15
GIRLS 7 11 18
TOTAL 13 20 33
I hope the above comes out correctly.
~MASKS = did not wear a mask.
Now can you answer the question?