Question

The average age of a brother and sister was 35 yr, 5 yr ago. What will be their average age (in yr) at present?​

Answer 1

Answer:

40

Step-by-step explanation:

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Answer 2

Answer:

40

step by step answers

Step-by-step explanation:

Let X & Y be the present ages of brother and sister.

(X-5) + (Y-5) / 2= 35

x+y -10 =70

x+y =80

// divide by 2 on both sides

x+y / 2 = 80 / 2= 40 .

Average age at present = 40