47-29=18 failed algebra
47-26=21 failed geometry
4 failed both
18+21-4=35 failed something
so, 47-35=12 passed both
A class of 47 students took examination in algebra and geometry. If 29 passed algebra and 26 passed geometry and 4 failed in both subjects, how many passed both subjects?
With solution please, tnx...
3 answers
NO ANSWER
12
1 answer