Question

There are four numbers A,B,C and D. Average of the first three i.e. A,B and C is 15 and that of B,C and D is 16.If D=16, then find A

Answer 1

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

According to the question

I+II+III15×3=45I+II+III15×3=45 .. (I)

II+III+IV16×3=48II+III+IV16×3=48 .. (II)

If IV number is = 19 then II + III = 48 - 19 = 29

Put this value in equation (i)

∴∴ I = 45 - 29

I = 16