Ken, Justin, and Tiff have read a total of 100 books from the library. Justin read 3 4. times as many books as Ken and Tiff read 2 times as many as Justin. How many books did Ken read?

7. \( \frac{3}{4}(2 x+1)=\frac{2}{3}(x+1) \)

\( \frac { a } { x + a } + \frac { b } { x - b } = \frac { a + b } { x - c } \)

8. Info \( 1: 7 x+2,5 x+12,2 x-1 \) is an arithmetic series \( \frac{10}{10}(\sqrt{3} \) Info \( 2: \sum_{k=1}^{n}(20-4 k)=-20 \), where, \( n \) is natural numbe a. Find the value of \( x \& \) determine the series from info 1 . b. Find the value of \( n \) from info 2 .

What is a proportional relationship?

1. Calcula dos números cuya suma sea 100 y de forma que su producto sea máximo.