The mean of three numbers is 70. if two of the numbers are 55 and 65 what is the third number

90

55+65=120

there are 3 numbers and when you divide them it makes 70.

70 x 3 = 210

210 - 120 = 90

55 + 65 + 90 = 210

210 / 3 = 70

I thin the third number would be 90 because if the mean of 3 numbers is 70 then multiply 70 an three and you get 210. Then add 55 and 65 and you get 120. Then do 210-120 and you get 90 so 90 is the third number.