Question
Billy's age is 25 of his granduncle's. His granduncle will be 68 years old in 13 years' time. In how many years' time will Billy's age be 23 that of his granduncle's?
3 m

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Billy's age is 25 of his granduncle's. His granduncle will be 68 years old in 13 years' time. In how many years' time will Billy's age be 23 that of his granduncle's?