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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Determine whether each ordered pair is a solution of the inequality x + y > 3. I'm just really having problems with all this. thanks. 1)One bank will lend money at 10% per year simple interest, while another will lend it at 9% per year compound interest. Which bank offers the best deal if money is borrowed for 1)