Afarmerhasfivesons.TheyareTed,Bob,Tom,JohnandBill.Johnhasnoelderbrother.Hewasfouryearsolderwhenhisfirstyoungerbrotherwasborn.ThenumberofTom‘selderbrothersisequaltohisyoungerbrothers.Billwillbetwenty-oneyearsoldnextyear,andheisfiveyearsolderthanBob.BobistwoyearsyoungerthanTom.Tedwassadbecausehehasnoyoungerbrother.TherearetwelveyearsbetweenhimandJohn.

　　一个农民有5个儿子.他们是Ted,Bob,Tom,John和Bill.John没有比他大的哥哥,他比第一个出生的比他小的那个弟弟大4岁,Tom哥哥的数量和他的弟弟的数量是一样的（就是他是老三）Bill明年就21岁了,他比Bob大5岁,比Tom小2岁,Ted因为没有弟弟而难过Ted和John之间差了12岁