3. Mary is twice as old as john and half as old as Bob. In 22 years’ time Bob will be twice as old as John. How old is Mary?
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hi friend i dont know the exact answer of these question but i have tried to solve these question
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Answer:
22
Step-by-step explanation:
let John's age is x and bob's y
mary's age = 2x=y/2............(1)
After 22 years.......john's age is x+22 and bob's age is y+22
According to given info. 2(x +22) = y +22
from (1) y = 4x
i.e., 2x + 44 = 4x + 22
4x + 44 = 2x + 22
2x = 22
x = 11
Mary's age is 2x i.e., 2*11 = 22
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