Question

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there are four number A B C and D.Average of the first three A B C is 15 and that of B C and D is 16 If the last number D is 19 the that first number is​

Answer 1

Step-by-step explanation:

abc=15

bc=15/a....(.1)

now,

bc+d=16

bc+19=16

15/a=-3

a=-5

Answer 2

Answer:

A=16

Step-by-step explanation:

B +C+D/3 = 16

B+C+19=16×3

B+C=48-19

B+C=29

NOW,

A+B+C/3=15

A+B+C=15×3

A+29=45 (B+C=29)

A=45-29

A=16

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