Let weight, in pounds, of fruit purchased be W

As purchase price was 90c per lb, cost of fruit was: 90W

If cost per pound was 15c less, then price, per lb would've been: 90 - 15, or 75c

At reduced price, she would've have been able to buy 4 more lbs, or a total of (W + 4) lbs

Price she'd then pay, at reduced price = 75(W + 4), or 75W + 300

Since she'd spend the same amount of money, we now get: Original cost of fruit = reduced cost of fruit, OR

90W = 75W + 300

90W - 75W = 300 -------- Subtracting 75W from right-side of equation

15W = 300

W, or weight of fruit she purchased = , or 20 lbs

Money she spent or cost of fruit: 20(90c), or 1,800 cents, or  

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