Please solve this question on rationalising denominators showing all working <3

Two blends of tea are mixed to make a blend that will be sold at the fair. black tea sells for $2.20 per pound and orange pekoe tea sells for $3.00 per pound. how much of each should be used to obtain a 4lb blend selling for $2.50 per pound?

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Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?