Sammy and David were selling water bottles to raise money for new football uniforms. Sammy sold 5 water bottles for every 3 water bottles David sold. Together they sold 160 water bottles. How many did each boy sell?
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assume sammy sell s bottle, and david sell D bottle, then we have
S+D = 160
S/5 = D/3
D = 0.6 S
S+0.6S = 160
S = 100
D = 60
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