49.
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When you add three of something to four of something, you get seven of something. It doesn't matter what the somethings are. Think of ninths as somethings. If you add three ninths and four ninths, you have to wind up with seven ninths. You can't wind up with seven eighteenths, because you weren't adding eighteenths to begin with.
To see if 89% is less than eight ninths, we need to convert eight ninths to a decimal so that the two can be readily compared. We do this by multiplying 8 by 100 and dividing by 9 - 800 ÷ 9 = 88.8888888 (recurring) %. So, if the 89% is exact, then it is not less than eight ninths. Depending on the degree of precision required, 88.8888888% would usually be rounded up to 89% and in that case the two amounts would be considered equal.
0.22222222222222222222222222222222
To multiply a fraction by a whole number, you first multiply the whole number by the numerator, then divide it by the denominator. In this case, we have 15, and need to multiply it by the numerator 7. 15x7 = 105. The next step is to divide this by the denominator 9. 105/9 = 11.666... When writing it down, you would simply put 7/9 x 15 = 11.666...
That would be 25/9.