Question 5
VariationIf N varies directly as M and N = 8 when M = 20, find M when N = 7.
- A.13
- B.15
- C.17½
- D.18½
Show the answer and explanation
Answer: C (17½)
Explanation
N = kM with k = 8/20 = 2/5. Then 7 = 2M/5, so M = 35/2 = 17½.
If N varies directly as M and N = 8 when M = 20, find M when N = 7.
Answer: C (17½)
N = kM with k = 8/20 = 2/5. Then 7 = 2M/5, so M = 35/2 = 17½.