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13+13+13=39
2 tens and 13 ones add up to 33 because 10 +10 +13 = 33.
When you add 8 and 5 the sum will be 13. On the other hand when you add 6 and 7 the sum will be 13. That's why it's equal to 13.
6 + 7 = 13(Sum means add)
An angle and its complement have to add to 90 degrees. 77 and 13 add to 90. 13 is the complement of 77. You will also be doing supplement. They add to 180.