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Students in a classroom have eaten 60% of jellybeans from a jar. There are now only 100 jellybeans left! How many jellybeans were in the jar to begin with?

show me some working out thanks

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Ishwar S. | University Professor - General and Organic ChemistryUniversity Professor - General and Organ...
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Let x = the original amount of jellybeans. 
 
If 60% of jellybeans were eaten, then you need to subtract 60% of x from the original amount. The difference between them equals 100.
 
x - 60%x = 100
 
x - 0.6x = 100
 
0.4x = 100
 
x = 100/0.4 = 250
 
Original # of jellybeans = 250