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If you divide the total cost ($49) by the number of reams (10), you get $/ream (dollars per ream).
Each sheet of A4 is exactly 1/16 sq m in area. A ream holds 500 sheets → a ream of A4 has an area of 500 x 1/16 sq m = 31 1/4 sq m = 31.25 sq m
1 mg equals how many grams?
12 gtt equals to how many drops
1/3 yard equals 1 foot.