A book cost 2/5 as much as a pen. Shar bought 10 books and 6 pens and had $240 left. If she spent 3/8 of her money on the pens, how much had she at first?
A book cost 2/5 as much as a pen. Shar bought 10 books and 6 pens and had $240 left. If she spent 3/8 of her money on the pens, how much had she at first?
Let the cost of a pen=P
2/5P=Cost of a book
Cost of Pen=$40
Cost of a book=$16
($40 X 6) + (10 X $16)=$400 Cost of pens and books.
$400 + $240=$640 The amount of money she started with.
