the sum of bobs weight and twice peters is 361 pounds. contrariwise, the sum of peters and twice bobs is 362 pounds. how much does each weigh?

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Bob is B and Peter is PB + 2P = 361 and P + 2B = 362therefore we substitute (doesnt matter which one we use) we will use B for times sakeB = 361-2Pso we substitute  the (361-2P) in the other equation for Bso: P + 2(361 - 2p) = 362P +722 - 4p = 362362 = 3PP = 120now substitute P as 120 in the first equation to find BB + 2(120) = 361B = 361-240B = 121So, B = 122 and P = 120