Verified Answer :

dexteright02

inversely proportional
4 ---------- 12
12 -------- x

\(\frac{4}{12} = \frac{x}{12}\)
\(\boxed{x = 4}\)

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inversely proportional
6 -------------- 10
18 ------------ x

\(\frac{6}{18} = \frac{x}{10}\)
\(18*x = 6*10\)
\(18x = 60\)
\(x = \frac{60}{18}\)
\(\boxed{x \approx 3,3}\)

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inversely proportional
4 ---------- 10 ----------- 60
30 -------- 10 ----------- x

\(\frac{4}{30} * \frac{10}{10} = \frac{x}{60}\)
\(\frac{40}{300} = \frac{x}{60}\)
\(300*x = 40*60\)
\(300x = 2400\)
\(x = \frac{2400}{300}\)
\(\boxed{x = 8}\)

Answer:

12 friends would pay $4 each

It would take 3.3 days to do the same amount

30 assistants would take 8 minutes to prepare the same amount

Step-by-step explanation: