exam Maths Puzzle Numerical Ability

The sum of the ages of Dorothy and Dorileen is 41. In 5 years, Dorothy will be twice as old as Dorileen. Find their age 3 years ago.

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PLEASE TRY AND SOLVE THESE QUESTIONS WITH THE INFO GIVEN HERE, i AM COMPLETELY LOST, I WOULDN'T KNOW WHERE TO START, AND SOMETIMES I THINK I AM MADE TO FAIL AT MATH, BECAUSE I ALWA 64. Minimizing cost. A company uses the formula C(x) = 0.02x^2 - 3.4x + 150 to model the unit cost in dollars for producing x stabilizer bars. For what number of bars id the unit cost at its minimum? What is the unit cost at level of production?