In a colony of alien frogs, every red frog turns into three blue frogs every night, and every blue frog turns into two red frogs every night. If you start with 1 red frog on Monday morning, how many total frogs will there be by Tuesday night?
9
Monday morning: 1 red. Monday night/Tuesday morning: 1 red becomes 3 blue. Tuesday night: 3 blue each become 2 red, totaling 3 * 2 = 6 red frogs. Wait, let's re-read carefully: 1 red -> 3 blue (Day 1). 3 blue -> 3 * 2 = 6 red. Total frogs = 6. Let's make a simpler one.
About this riddle
Math riddles hide a calculation inside a short story. Pull out the numbers, work out what is being asked, and watch for a trick such as a unit change.
Difficulty: Hard. More like this: Math riddles with answers or try Target 24 for a different kind of puzzle.
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