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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exam Other Question

A diesel engine block 136 in. long is being machined on a milling machine. The milling cutter has 12 teeth, rotates at 350 rpm, and removes metal at the rate of 0.025in. per tooth How would you factor out the greatest common factor of this problem?

1/3y^5-2/3y^2