This is how you reach 1074:

75+64+82+87+82+75+73+28+83+32+91+78+58+73+93 = 1074

I fail to see what's confusing. Addition is commutative btw, it doesn't matter in which order you add them. The test is fine as it is.

Then as i said u should change that sentence, because it only confuses

Top-down or bottom-up doesn't matter, there is only one correct answer either way: 1074.

The result should be 1064 and not 1074, the other answers to this problem is that there is another way to get 1074, but the issue is on the sentence that says "" Let's say that the 'slide down' is the maximum sum of consecutive numbers from the top to the bottom of the pyramid. "" Where it clearly says that the sum should be done FROM the top TO the bottom, so ill sugest that or the result of the test should be changed to 1064 or modify the sentence.