Question

If a microwave oven takes 12 seconds to cook 1 sandwich, 4 additional seconds to cook 2 sandwiches, and 1 additional second for every sandwich after that, how long does it take to cook 5 sandwiches at once?

Answer 1

19 seconds

Explanation:

the first sandwich is 12 seconds and the next is an extra 4 which brings us to 16 than it takes 1 extra second and 1 times 3 is 3 and 16+3=19