Question

The number of questions Jennifer can answer on a worksheet is directly proportional to how many minutes she studied. If she studies t minutes she can answer d questions. How many questions can she answer, in terms of t and d, if she studied 10 minutes?

A) 10td
B) 10d/t
C) 10t/d
D) d/t

Answer 1

Answer: B)
`=10(d)/(t)`

Explanation:

Given: The number of questions Jennifer can answer on a worksheet is directly proportional to how many minutes she studied.

If she studies t minutes (independent variable) she can answer d questions (dependent variable) then

`d=kt`, where k= proportionality constant

Then,
`k=(d)/(t)`

If she studied 10 minutes, the number of question she answered=
`10k`

If we put value of k in it, we get
`=10(d)/(t)`