math

walking through 3 gates 2 friends have to leave 1/4 of their money at each gate. how much money did they have at the start to have \$648 left

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1. A is the starting amount

(3A/4) after the first gate
A(3/4)^2 after the second gate...

so
A(3/4)^3=648

A= 648*4*4*4/27=648*64/27= ...

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