Answer:
10
Explanation:
Hello! So over here, when they use the word "directly," they're hinting that they want you to use direct proportions.
You know that the mass and the weight directly correlate, which means that they are direct proportions.
We are given a comparison of mass to weight as an example. Mass:Weight = 8:64
If we simplify that ratio, we get 1:8. The ratio of Mass:Weight is 1:8. In other words, the mass is 8 times less than the weight.
We are given our new weight of 80. Since mass is 8 times less than weight, we do 80/8 which equals 10.
Let me know if you have any questions.