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Pls solve this question

Pls Solve This Question class=

Sagot :

Answer:

4

Step-by-step explanation:

(A+B+C+D) / 4 = 10 .... average=sum/number of item

(A+B+C)/3 = 3D ... average of first 3 (A,B,C) is triple of forth (D)

A+B+C = 9D

(9D+D)/4=10

10D = 40

D = 4

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