Question

Use the numbers 7,5,6, and 3 and only use them once to create a expression to get to the sum of 75

Answer 1

Since you're asked to find the sum you can only do this through addition. To get to 75 using the numbers only once, here is the solution:

67 + 5 = 72

72 + 3 = 75

Answer 2

You can do this using the equation below.
(6 x (7+5)) + 3
(6 x 12) +3
72 + 3
75

Hope this helps! :)