how many belts can be made by the old machine

A new machine makes a certain number of belts in 120 minutes. The old machine makes the same number of belts but in 155 minutes, taking 5 minutes longer per belt than the new machine. How many belts can be made by the old machine?
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1 Answer

same anser as last time...old masheen take 5 minuts longer,

155-120=35 minuts=7 belts
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