There is four number average of the first three is 15 and that of the last three is 16 if the last number is 19 find the first number?
Answer: 16
Explanation
Given information:
-
The average of the first three numbers (A, B, C) is 15
A+B+C/3=15 A+B+C=45 -
The average of the last three numbers (B, C, D) is 16
B+C+D/3=16 B+C+D=48 -
The last number (D) is 19
B+C+19=48 B+C=29
Finding A
We already have:
A+B+C=45
Substituting B+C=29:
A+29=45A=45−29 A=16
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