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

Answer :  14 

17 x 2 = 34 

12 x 3 = 36 

⇒ 36 + 34 = 70

⇒ 70 : 5 = 14