Answer:

1. R=P/B ?=50/5

Answer: 10

2. P=B×R ?=60×.40

Answer: 24

3. R=P/B ?=64/16

Answer: 4

4. B=R÷P ?=.15÷8910

Answer: 59400

5. B=R÷P 150=.43÷64.5

Answer: 150

-sorry no solution in no.4