Problem 2. The Rule of Three.

Arthur plays on the computer 6 hours in 3 days. In how many days will Arthur play 64 hours?

Fill in here

Remember !

The simple rule of three is solved by identifying the relation of direct proportionality, then the unknown is calculated out of proportion.

Exemple !

Arthur plays on the computer 9 hours in 2 days. In how many days will Arthur play 45 hours?

We note with y the unknown value.

9/45
=
2/y

y = 45 x 2 : 9

y = 10

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