The chemist mixes 3 ml of limestone for every 5 l of water. if she uses 35 l of water how much limestone should she use? a)21 ml b)28 ml c)14 ml d)none of the above

To find the amount of limestone to add, you will set up a proportion of the amount of limestone to the amount of water.

Limestone    3 ml x 7     x
Water           5 L  x 7    35 L

To solve for x, multiply 3 and 7 to get 21.

The chemist will need 21 milliliters of limestone.

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