Soal SMP · Soal cerita · Kesulitan 3/5
In a school, 2/5 of the students are in grade 7, 1/3 are in grade 8, and the rest are in grade 9. If there are 180 students in grade 9, how many students are in the school?
- A.600 students
- B.675 students
- C.700 students
- D.750 students
Kunci jawaban & pembahasan
Jawaban: 675 students
Fraction for grade 9 = 1 − (2/5 + 1/3) = 1 − (6/15 + 5/15) = 1 − 11/15 = 4/15. If 4/15 = 180, total = 180 × 15/4 = 675 students.
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