17. The average of a, b, c and 130 is 30 less than the average of b, c, d and 140 what is the value of d-a? A. 100 B. -90 Fl. 110 D. We can't determine from the given information
Answers
Answered by
0
Answer:
It should be -40
Step-by-step explanation:
a+b+c+130/4 -30 = b+c+d+140/4
(a+b+c+100 -b-c-d) / 4 =0
(a - d - 40) / 4 = 0
a-d-40=0
d-a = -40
Similar questions