Yvette collects gems. She has been collecting them for 3 years. Her favourites are
diamonds. Altogether she has 233 gems. 75 of these are diamonds. How many of her gemstones collection are not diamonds?
I added 25 to the 75 to make 100. Then I added 133 to the 100 and made 233. 25 to 133 equals 158. There are 75 diamonds and 158 other gems.
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