Emmett does 12 jumping jacks, 8 pushups, and 20 situps. What percentage of his exercises were pushups?
First find the total number of exercises Emmett does: 12 jumping jacks + 8 pushups + 20 situps = <<12+8+20=40>>40 exercises
Then divide the number of pushups by the total number of exercises and multiply by 100% to express the answer as a percentage: 8 pushups / 40 exercises * 100% = 20%
#### 20