Question

3 ft of a 3 inch crown molding costs you $10.25 at the lumber store. How much would it cost for 42 ft?

Answer 1

3 ft of a 3 inch molding costs $10.25.

How much would it cost for 42 ft?

Note that 42 ft is 14 times 3 ft

$42=14\times3$

So the cost will also be 14 times the cost of 3 ft. This will be :

$14\times10.25=143.5$

The answer is 143.5