The phrase "Jim and Joe" is most likely a plural noun subject in this case. (But note in my previous sentence I used the word "is," a singular verb, which indicates that, as a phrase, the combination...
Joe + Jim = 59 so Joe = 59 - Jim;Joe + 8 = 2(Jim + 8);Substituting: 59 - Jim + 8 = 2Jim + 16ie 67 - 16 = 3Jim3Jim = 51 so Jim is 17, making Joe 42Check: In 8 years Jim 25, Joe 50; Shazam!
Joe + Jim = 67 so Joe = 67 - Jim; Joe + 7 = 2(Jim + 7) ie 2 x Jim + 14 ie 67 - Jim + 7 = 2 x Jim + 14 ie 3 x Jim = 60. Jim is 20, Joe is 47. (In 7 years Jim 27, Joe 54). (Can we have different...