Question

average of three no is 7 first two no =5 3rd no=? find third number ​

Answer 1

Answer:

11

Step-by-step explanation:

avg of 3 numbers is 7, then their sum is 7 x 3=21

avg of 1st 2 numbers is 5, then their sum is 5 x 2=10

then 3rd number =21-10=11

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