48 ? 48 ? 6 = 40

1. 48 / 48 = 1
2. 1 * 6 = 6. This does not equal 40. Re-evaluating. 48 - 48 = 0. 0 * 6 = 0. This does not equal 40. Re-evaluating. 48 + 48 = 96. 96 / 6 = 16. This does not equal 40. Re-evaluating. 48 - 6 = 42. 42 - 48 = -6. Re-evaluating. 48 + 6 = 54. 54 - 48 = 6. Re-evaluating. 48 * 6 = 288. 288 - 48 = 240. Re-evaluating. 48 / 6 = 8. 48 - 8 = 40.