Question 1200089
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If you don't need a formal algebraic solution, and if getting to the answer quickly is important (as in a timed math competition), then here is a way to solve any 2-part "mixture" problem like this.<br>
$10.20 is 1.20/4.00 = 3/10 of the way from $9.00 to $13.00
That means 3/10 of the mixture should be the more expensive cheese<br>
ANSWER: 3/10 of 5 kg, or 1.5 kg, of the more expensive pepper cheddar cheese; the other 3.5 kg of the less expensive Pennsylvania Jack.<br>