Add fractions with unlike denominators

Which ratio is equivalent to 10: 85

Asilkworm winds its cocoon out of one long silk fiber. to make silk thread, 3 to 10 of these silk fibers are unwound from their cocoons and combined into aa single thread with a typical length of 300 yards. choose a reasonable number of silk fibers in a thread write an equation to find the total length of the silk fibersused in 300 yards of the thread

Acredit card advertises an annual interest rate of 23%. what is the equivalent monthly interest rate?