1 cubic metre of concrete had a weight of 240 kg. 15% of the concrete is water. The rest of the ingredients of concrete are cement, sand and stone.
The weights of these ingredients are in the ratio 1:2:5
work out the weight of the cement, sand and stone in 1 cubic metre of concrete.

please please help i really need it done

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?