Sara can lift a 10-pound weight by applying 30 pounds of force to a lever. If the amount of force Sara needs to apply to a lever is proportional to the weight she can lift, how much force would she need to apply in order to lift a 25-pound weight?

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Answer 1 · 2018-06-30T15:42:30

#75# pounds of force to the lever.

We know that the force she applies to the lever is directly proportional to the weight she can lift.

So, we get:

#(30)/(10)=(F_(l_2))/(25)#

#3=(F_(l_2))/(25)#

#:.F_(l_2)=3*25#

#=75#