Okay I put -646/15 but it’s wrong can someone help me

-30 5/6

Step-by-step explanation:

You are adding two negative numbers, so add their absolute values and make the answer negative.

-28 1/3 + (-2 1/2) =

= -(28 1/3 + 2 1/2)

We add the absolute values 28 1/3 and 2 1/2. We need a common denominator for the fractions. The LCD of 2 and 3 is 6.

= -(28 + 2 + 1/3 + 1/2)

= -(30 + 2/6 + 3/5)

= -(30 5/6)

= -30 5/6

answer: procent 54 wynosi 33,33%