A builder uses the ratio of 3 parts of cement to 12 parts of sand to make a mixture that holds bricks together . How many parts of cement does the builder use for each part of sand ?

1/4 parts of cement

Step-by-step explanation:

Given :

3 parts of cement = 12 parts of sand

For each part of sand, let the part of cement used = x

Writing the relation in the form of cross multiplication :

3 = 12

x = 1

Cross multiply :

12x = 3

x = 3 / 12

x = 1/4

Hence, for each part of sand, 1/4 parts of cement is used.

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