You have 9 identical-looking coins; one is heavier. With a balance scale, explain how you could find the heavy coin in two weighings. Last week's answer: 40 miles per hour
A school store sells notebooks, folders, pens and pencils. You can buy five notebooks, five folders and two pencils for $32.00. You can buy two notebooks, two folders and three erasers for $13.50. Find the cost of one eraser if each pencil costs $1.00. Last week's answer: Split the coins into 3 groups (Group A, Group B, Group C) of 3. Weigh Group A vs. Group B. If equal → heavy coin is in Group C. If not equal…
