Ms. Johnson has a box of 60 red and black pens on the shelf. If the ratio of red to black pens is 2 to 3, how many red pens does she have?

40 red pens I believe

Red to Black.

2 to 3.

For every 2 red we have 3 black so

For 4 red we have 6 black and so on ...

Notice that

For every 2+3=5 pens we have 2 red ones

If we divide the total number of pens 60 into groups of 5 we will get 60 / 5 = 12 groups.

12 groups •2 red pens=24 red pens