It is: (21+35)/2 = 28
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The average is 35. (21 + 35 + 49 (=105), divided by 3.)
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.
21 is 35% of 60
21/35 = 3/5
21/35 = 3/5