Question

Sam can solve 30 multiplication problems in 2 minutes how many can he solve in 20 Minutes

Answer 1

If Sam can solve 30 in 2 minutes, we can find how many he can do in 1 minute by doing 30/2 = 15

If Sam can solve 15 multiplication problems every 1 minute, then we can multiply the number he can do in 1 minute by the number of minutes.

So minutes x problems per minute = answer

20 x 15 = 300

Sam can solve 300 problems in 20 minutes

Answer 2

Hi there!
The question here gives us that Sam can solve 30 multiplication problems in 2 minutes, and we are asked to solve it in 20 minutes. There are many ways to get the answer, but I'll be showing you the easiest method.
Let the number of problems Sam solves in 20 minutes be represented by x
First, write the given information.
30 problems = 2 minutes
x problems = 20 minutes
We can rewrite the given information like this - 
$\frac{30}{x} = \frac{2}{20}$
Use cross multiplication to simplify further - 
$600 = 2x$
Divide both sides by 2 - 
$x=300$
Therefore, Sam can do 300 problems in 20 minutes. Hope this helped!