Lizzy: Of the 100 soccer balls that Nova went to inflate, 40 percent had holes in them and could not inflate, while 20% of the remaining balls were overinflated and exploded. How many balls were inflated successfully and could be used?.
Me: Hmmm, let me think. I think this is the detailed solution:
If 40% of the balls had holes in them and could not inflate, their number was 40 / 100 * 100 = 40. The remaining balls that Nova could inflate were 100 - 40 = 60. While inflating, 20% of the good soccer balls were overinflated and exploded up, a total of 20 / 100 * 60 = 12. The number of soccer balls that inflated successfully and could be used is 60 - 12 = 48. Final answer: 48.