Andy, Jenny, and Parker share a sum of money. Andy gets 20% and Jenny gets 10% more than Parker. Parker spends 3/5 of his share. What percent of the total amount of money does Parker have left?
Let's say the sum of money was $10
Then, Andy got 20% of 10 = $2
That means Jenny and Parker share the rest, which is $8
Let J = the amount that Jenny got
Let P = the amount that Parker got
J+P = 8
and Jenny got 10% more than Parker
so, J = (1.1)P
1.1P + P = 8
2.1P = 8
P = $3.81
But he spent 3/5 and only has 2/5 left
so, (2/5)(3.81) = $1.52
$1.52 / $10 = 0.152 = 15.2% which the percentage of the total amount of money that Parker has left.
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