exam Maths Puzzle Numerical Ability

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

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A rope was cut into two pieces so that one piece was 18 m longer than the other. That piece was also three times as long as the other. How long was each piece and how long was th 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 ?