This year 75% of graduating students at Walker high had taken 8 math courses.

Question

This year 75% of graduating students at Walker high had taken 8 math courses. Of the remaining class, 60% had taken 6 or 7 math courses. What percent had taken fewer than 6 math courses?

Answer 1

75% took 8 math courses

the remaining class consists of 25%, 60% of which took 6 or 7 math courses

60% of 25%=0.6*25%=15% took 6 or 7 math courses

75%+15%=90% took 6, 7, or 8 math courses

100%-90%=10% took fewer than 6 math courses