23 red marbles is 40% of _ marbles

57.5 marbles rounding to 58 if you do not have partial marbles

Step-by-step explanation:

The number of marbles is equal to the percent of the marbles times the total number of marbles

23 = 40% total marbles

Change to decimal form

23 =.40 M

Divide by. 40

23/.40 =.40M/.40

57.5 = M

This question is odd since you can't have part of a marble

I would round up and have 58 marbles

58 *.40 = 23.2 marbles