Question

the average age of a brother and sister was 35 yr, 5 yr ago what will be their average age at present

Answer 1

Answer:

40

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

Answer 2

Answer:

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