Answer:

Step-by-step explanation:

Or, if you mean (r+3Q)/h=t:

According to the United States Mint, the mass of 1 nickel is 5.000 g.

There are 15 nickles in 75 cents worth of nickels.
15 * 5.000 g = 75.000 g
Answer: 75.000 grams
I think its 92 but im not entirely sure. hope it helps though