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John's father is five times older than John and John is twice as old as his sister Alice. In two years time the sum of their ages will be 58. How old is John now?
John's father is 5 times older than John F = 5J John is twice as old as his sister Alice. J = 2A or A = .5J In two years time, the sum of their ages will be 58.F+2 + J+2 + A+2 = 58F + J + A + 6 = 58 F + J + A = 58 - 6 F + J + A = 52: How old is John now?:Substitute for F & A 5J + J + .5J = 52 6.5J = 52 J = 52/6.5 J = 8 yrs John is 8 years old
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