The force (in pound-force) needed to keep a car from skidding on a curve varies directly with the weight of the car (in pounds) and the square of its speed (in miles per hour [mph]) and inversely with the radius (in feet) of the curve. Suppose 6125 pound force is required to keep a 2750 pound car, travelling at a speed of 35 mph, from skidding on a curve of radius 550 feet. How much pound-force is then required to keep a 3600 pound car, travelling at a speed of 50 mph, from skidding on a curve of radius 750 feet?

What smallest positive number should be subtracted from 2 and 3 so that 4 is the third proportion to them?

The ratio of the number of boys in a school to the total number of boys and girls in that school is 7 ∶ 17. If the number of boys in that school is 1099, then how many girls are there in that school?

The following table shows the percentage of population of five states below poverty line and the proportion of males and females below and above poverty line.

State	Percentage of Population	Proportion of Males and females
		Below Poverty Line	Above Poverty Line
		Males : Females	Males : Females
A	25%	7 : 3	1 : 5
B	13%	8 : 5	1 : 7
C	26%	9 : 4	2 : 11
D	11%	4 : 3	13 : 4
E	17%	5 : 9	3 : 2

If the population of state B and State C is 6,000 each, then what is the total number of females below poverty line in these two states?