Mara has 3 times as many dollars as her brother, Timmy. If Mara is given $20 by their mother, she will have 7 times as many dollars as Timmy. How many dollars does Timmy have?
This brainteaser was supplied by the Mathematical Olympiads for Elementary and Middle Schools (www.moems.org).
Problem and solution
Mara has 3 times as many dollars as her brother, Timmy. If Mara is given $20 by their mother, she will have 7 times as many dollars as Timmy. How many dollars does Timmy have?
This brainteaser was supplied by the Mathematical Olympiads for Elementary and Middle Schools (www.moems.org).
Problem and solution
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