Thyqueenmary Thyqueenmary

22-04-2016
Mathematics

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If in a rock collection 60% of the rocks are Quartz how many rocks are Quartz if there are 35 rocks?

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vanskikranski vanskikranski

22-04-2016

If 60% of the rocks are Quartz, you need to multiply the total number of rocks by 60% (this is the same as multiplying by 0.6 as 0.6=60%)
So 35 x 0.6 = 21
Therefore there are 21 quartz rocks in the collection.

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