Mike is three times as old as his little sister, Mary. In 4 years, he will be twice as old as Mary. How old is Mary?
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Let Mary be x years old
Mike is 3x years old
In 4 years Mary would be (x+4)yr old
and Mike would be 2(x+4)
Mikes age after 4 years 3x + 4 = 2(x+4)
⇒ x = 4
Mary is 4 years old
Mike is 3x years old
In 4 years Mary would be (x+4)yr old
and Mike would be 2(x+4)
Mikes age after 4 years 3x + 4 = 2(x+4)
⇒ x = 4
Mary is 4 years old
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