Elementary Brain Teaser

Fun and accessible problems for younger students or beginners. Posted every Monday, these weekly brain teasers kickstart your week with a mental warm-up.

A toy box contains building blocks in four colors: red, blue, green, and yellow.  One-third of all the blocks are red. Of the blocks that remain, one-half are blue. Of the blocks still remaining, three-fourths are green. All the blocks left are yellow. If the box contains a total of 432 blocks, how many are yellow?


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