What is 16 as a percentage of 80

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?

There were 25 students who answered to a survey about sports. four-fifths of them like football. how many students like football?

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?