An 8ft board is cut into two pieces whose lengths are in the ratio 7:5. What is the number of inches in the length of the longer piece?

Question

anonymous · Answer

lets call the length of the larger piece $x$ so the length of the shorter piece is then $8-x$
you know $\frac{x}{8-x}=\frac{7}{5}$ so you can solve for $x$

anonymous · Answer

cross multiply, get 
$$5x=7(8-x)$$ and then solve the linear equation

anonymous · Answer

5x=56-7x then +7x to each side is 12x=56 divide by 12 is about 4.6 . so the answer is 4.6 ?

anonymous · Answer

hello?