The average of p,q,r is4,and average number of p,q,r,x is 5,then x=____

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The average of p,q,r is4,and average number of p,q,r,x is 5,then x=____

The average of p,q,r is4,and average number of p,q,r,x is 5,then x=____
The average of p,q,r is4,and average number of p,q,r,x is 5,then x=____

The average of p,q,r is4,and average number of p,q,r,x is 5,then x=____
The average of p,q,r is4,and average number of p,q,r,x is 5,then x=_8___

题目翻译:(英文词典:average number 平均数)

  •  已知数p,q,r的平均数是4,而且数p,q,r,x的平均数是5,求x的值

  1. p,q,r的总和为:4*3=12;

  2. 则p,q,r,x的总和为:12+x;

  • 可列出方程:(12+x)/4=5;

       解得:x=8.

     

x=8
p+q+r=4×3=12
p+q+r+x=5×4=20,故x=8

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