In Lee's grade, 3/5 of the students have a sister. Of the students who have a sister, 1/2 also have a brother. What fraction of the students in Lee's grade have both a sister and a
brother?
Write your answer as a fraction or as a whole or mixed number.
of the students

Data from 2005 for various age groups show that for each $100 increase in the median weekly income for whites, the median weekly income of blacks increases by $105. also, for workers of ages 25 to 54 the median weekly income for whites was $676 and for blacks was $527. (a) let w represent the median weekly income for whites and b the median weekly income for blacks, and write the equation of the line that gives b as a linear function of w. b = (b) when the median weekly income for whites is $760, what does the equation in (a) predict for the median weekly income for blacks?