What is the answer for this question ?:A set of multiples of 5 less than 30​

What does x = in this equation x+3+2x=x+5

The zoo collects $9.60 for every 24 tickets sold. how much will be collected for 400 tickets?

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?