Allie need to buy at least 12 candles plain candles sell for 4 each and scented candles sell for 7 each she can spend no more than 57

there were 9 plain candles and 3 scented candles.

Explanation:

Let she buys x candles for 4 each and buys y candles for 7 each.

Then According to the questions

x+y= 121

and

4x+7y= 572

solving 1 and 2 we get the values of x and y as 9 and 3 respectively.

So, there were 9 plain candles and 3 scented candles.

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