Question

18. Mr. Johnson is making a design of stones in his backyard. • The design has 5 square stones and some rectangular stones. • The square stones cost $2.50 each, and the rectangular stones cost $2.95 each. • The total cost of the design is $36.10. How many rectangular stones does Mr. Johnson use?

Answer 1

Mr. Johnson uses 8 rectangular stones in his backyard design, calculating the total cost of square stones and subtracting it from the overall total to find the cost for rectangular stones, then dividing by the price per rectangular stone.

Step-by-step explanation:

Mr. Johnson is using square stones at $2.50 each and rectangular stones at $2.95 each, with a total cost of $36.10 for his backyard design. To solve this problem, we need to perform a few steps:

1. Calculate the cost of 5 square stones: 5 stones × $2.50 per stone = $12.50 total for square stones.
2. Subtract the cost of the square stones from the total cost to find out how much money was spent on rectangular stones: $36.10 total - $12.50 square stones = $23.60 spent on rectangular stones.
3. Divide the money spent on rectangular stones by the cost per rectangular stone to find out the number of rectangular stones: $23.60 / $2.95 per rectangular stone = 8 rectangular stones.

Therefore, Mr. Johnson uses 8 rectangular stones in his backyard design.