18

Step-by-step explanation:

To find out, let us first transform 20% into its decimal form by dividing it to 100.

20 ÷ 100 = .20

After transforming the percentage into its decimal form, let us multiply .20 to the supposed number which is 90.

90 × .20 = 18

Therefore, 18 is 20% of 90.

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Answer:

18

Explanation:

Make the given percentage into its decimal form, then multiply both decimal and whole number.