15 add 20 = 35
-5
add 9 add 1 subtract 20 add 9 add 1
Sum means add them together.15+20=35
Neither.
-85
The words, "sum of" mean 'the added together value of'... For instance, "What is the sum of 15, 20 and 45?" The method is to add each of these figures together: EG. 15 + 20 + 45 The answer, of course, is 80 ... written: 15 + 20 + 45 = 80, or 15+20+45=80
Three numbers that add up to 50 could be 10, 20, and 20. Another example could be 15, 15, and 20. There are countless combinations, but all must total 50 when summed together.
25
-5 and -15 because -5 + -15 equals -5 - 15 which is -20 and -5 multiplied by -15 = 75 (two negatives multiply to make a positive)
If you add 27 and 8, the answer is 35. 7 plus 8 is 15 and add it to 20, the answer is 35.
115
33/4+43/5... First - add the whole numbers... 3+4=7 Next - make both fractions have the same denominator... 3/4 = 15/20 and 3/5 = 12/20 Now - add the two fractions together... 15/20 + 12/20 = 27/20 27/20 = 17/20. Now all you need to do is add the 7 from the first step, and you have the answer 87/20 15/4 = 75/20 23/5 = 92/20 75 + 92 = 167/20 = 8 and 7/20