Grade 6 Math Circles Worksheet - University Of Waterloo, 2015 Page 10
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1013. Two campers have flashlights that blink every few seconds. The first camper’s flashlight
blinks every 4 seconds and the second’s blinks every 6 seconds. If they turn on their
flashlights at the same time, how many times will they flash simultaneously in one
minute?
14. James is buying burgers and buns. Burgers come in packs of 24, but buns come in
packs of 16. What is the least number of packs of each that James will have to buy in
order to have no burgers or buns left over?
15. Two numbers are co-prime if they do not have any prime factors in common. List all
possible numbers that are co-primes with the following numbers that are less than 50:
(a) 390
(b) 210
(c) 49335
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