Can you find the Error in the problem below?

Find the Error #2:

"In the second part of the discussion I need to solve for the child's age given the adult dosage of the medicine is 800mg and the child's is 233mg. We will be using the sameliteral equationbut the variable we will use to solve is a instead of d.

d =D(a + 1)This is Crowling's Ruleformula

24

233 =800(a+1)Instead of D Isubstitutedit with 800 and 233 for d.

24

So since I substituted both values the result is aconditional equationso this would only make the variable a true.

233(24) =800(a+1)(24)We multiplied on both sides by 24 to eliminate denominator.

24

5592 = 800(a+1)Multiplication is done on the left.

5592=800(a+1)I divided both sides by 800

800800

5.592 = a +1I have one more step to do then it will besolved.

5.592 - 1 = a + 1 - 1I subtracted 1 from both sides to get rid of the a

4.492 = aWe have solved the problem for a.

A child that is 4 yrs.old can have a dose of 233mg of ibuprofen."