Question 7: Given five numbers, the average of two numbers is 17 and the average of the other three numbers is 12. The average of all these number is............. Giúp mình với ạ :<<
2 câu trả lời
it 's 14
because 17 . 2 = 34 ; 36 + 34 = 70
so 70 : 5 = 14
=> the answer is 14