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19 is 581/3% more than 12.
Well, if Plant B was 19 centimeters tall in Week 3, and we're talking about how much it grew in Week 3, then it didn't grow at all in Week 3. It stayed the same height, honey. No growth spurt for Plant B that week.
John read 80 pages out of 240 pages last week, which is 80/240 or 1/3 of the book. This week, he read 60 pages out of 240 pages, which is 60/240 or 1/4 of the book. Therefore, he has read a total of 1/3 + 1/4 = 7/12 of the book. To find out what fraction he still has to read, subtract 7/12 from 1 (the whole book), which equals 5/12. So, John still has 5/12 of the book left to read.
12+3(y) 12+ 3(-3) 12 + {3x (-3)} 12+ (-9) 12-9 3
3 - (-12) = 3 + 12 = 15.