Question

The expression 2(l + w) is used to calculate the perimeter of a rectangle, where l is length and w is width. If the length is Fraction 2 over 5 unit and the width is Fraction 1 over 5 unit, what is the perimeter of the rectangle in units?
Fraction 3 over 5 unit
1 unit
1Fraction 1 over 5 units
2Fraction 3 over 5 units

Answer 1

Answer is 1 fraction, 1/5. See picture for clarity.

Answer 2

So basically, since the formula is 2(l × w), we will do:
(Length) 2/5 + 2/5 (the same thing as multiplying it by two) which equals 4/5.
Then we do the same for the width:
(Width) 1/5 + 1/5 (also the same thing as multiplying by two) to get 2/5.

Now we just add both fractions: 4/5 + 2/5 = 1 1/5 
So the answer is C.