exam Maths Puzzle Numerical Ability

A KELLY BOUGHT 2 TACOS AND 3 ENCHILLADAS. FRED BOUGHT 3 TACOS AND 5 ENCHILLADAS. ONE BILL IS $7.80 THE OTHER IS $12.70. HOW MUCH WAS EACH TACO AND ECHILLADA ?

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I hate to bother you (I have the answer to the question in the back of the book) but even though I know the answer, I do not understand HOW they came up with the answers.

Temple A person invested $17,000 for one year, part at 10% part at 12% and the remainder at 15%. The total annual income from these investments was $2110. The amount of money invested at