20
the sum of -2 and 6 and 7 is (-2+6+7)
What is the ratio of 28 to 49 is
It is 6+7 = 13.
6 + 7 = 13(Sum means add)
19
6:7 ratio
It is 6/7.
3 & 7? Sum 10, difference 4 so ratio 5:2 or 1 & 21? Sum = 22, difference 20 so ratio 11:10
-6 + 7 - 4 = -3
6(7+6a)
35/6 and 7/6