Question

If 5 10 15 and x,s average is 20 then what is the mean of x

Answer 1

average = sum of the numbers /2

20=5+10+15+x/2

20×2=30+x

40=30x

40-30=x

10=x

Answer 2

Answer:

x = 50

Step-by-step explanation:

terms are 5 , 10, 15 , x

average are 20

(5 + 10 + 15 + x)/4 = 20

(20 + x)/4 = 20

30 + x = 20 × 4

30 + x = 80

x = 80 - 30

x = 50