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Warren drives his car 90 miles and has a mean of a certain speed. If the mean speed had been 4 mph more, he could have traveled 102 miles in the same length of time. What was his mean speed?

doreen is a chemist. she needs to prepare 28 ounces of a 11% acid solution. find the amount of 14% solution and the amount of 7% solution she should mix to get this solution   how many...

sarah blends coffee for tastidelight. she needs to prepare 160 pounds of blended coffee beans selling for $4.94 per pound. she plans to do this by blending together a high quality bean costing $6...

kevin and randy have a jar containing 28 coins, all of which are quarters or nickels. the total vALUE of the coins in the jar is $4.00 how many of each type of coin do they have??   __...

jim began a 177 mile bicylcle trip to build up stamina for a triathlete competition. his bicylcle chain broke so he finished the trip walking. the trip took 6 hours total. if jim walks at a rate of...

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