Answer:Here are the solutions: 1. (10 x 3) ÷ (5 + 1) = 62. (10 + 5) ÷ (3 x 1) = 73. (10 + 5) ÷ (1 x 3) =5. This is not 28. There is no solution using the numbers 1, 3, 5, and 10 only once to reach 28.4. 10 ÷ (5 - 3) = 5. This is not 2. There is no solution using the numbers 1, 3, 5, and 10 only once to reach 2.5. 10 + (5 x 3) x 1 = 25. This is not 36. There is no solution using the numbers 1, 3, 5, and 10 only once to reach 36. Important Note: Problems 3, 4, and 5 do not have solutions using the provided numbers and only one instance of each number. The constraints of the problem make these unsolvable.