how much do you need to add to 15 to make it 60
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15+15+15+15=60
15 percent of 60 = 915% of 60= 15% * 60= 0.15 * 60= 9
The two numbers you are looking for are -15 and 4. When you multiply -15 and 4, you get -60, and when you add them together, you get -13.
79
15 times.