Ella has 0.5 lbs of sugar. how much water should she add to make the following concentrations? tell ella how much syrup she will have in each case for 75% syrup?

To answer this item, let x be the amount of water. The concentration (in % sugar) of the solution is calculated by dividing the amount of sugar by the total amount. That is,

       C = (S/ (S + x))(100%)

Substituting the known values to the equation,

      75 = ((0.5/(0.5 + x))(100%)

The value of x from the equation is 0.167.

0.167 lbs of water

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.