40 Year 7 students and 60 Year 8 students were asked what their favourite science lesson was – physics, biology or chemistry.
6 of the 8 students who said chemistry were in Year 8.
30 students said Physics.
3/4 of the Year 7 students said Biology.
Work out the number of Year 8 students who said Biology was their favourite science lesson.
Answer:
Chemistry students:
8 students said chemistry 6 from year 8 and therefore 2 from year 7
Physics students:
30 students said physics therefore 100 – 8 – 30 = 62 students remaining for Biology
Biology students:
Year 7 biology students: ¾ x 40 = 30
Year 8 biology = Total biology – year 7 biology = 62 – 30 = 32
Answer: 32