109
average:
= (28 + 190)/2
= 218/2
= 109
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Halfway between 18 and 28 is (18 + 28) ÷ 2 = 23.
To find the number halfway between any two numbers x and y, add x and y, then divide the answer by 2. So for 21 and 35, 21+ 35 = 56. 56/2 = 28. You can check your answer by seeing that 21 + 7 = 28 and 35 - 7 = 28.
Average of three = 20 so total of three = 60; 60 - (28 + 15) = 60 - 43 = 17
-190
3 with remainder 28.