Answer: 45%
Work:
20 is decreased to 11
9 = D x 20
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20 20
20 divided by 9 = .45
.45 as a percent = 45 %
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"Decreased by" just means "minus," so that's C-11.
60 decreased by 40 is 20.
620 - 20% = 496
15% of 20 is 3 so 20-3 = 17
20