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18 is 40% of 45.
The largest number that can be divided by both 18 and 45 is 9. 18 divided by 9 is 2 and 45 divided by 9 is 5.
45
18 is what percent of 45= 18 / 45= 0.4Converting decimal to a percentage:0.4 * 100 = 40%
(18 + 36) + (45 - 27) = 54 + 18 = 72