What is the value of $1980 ÷ 9 + [-77 + \begin{Bmatrix}-1980 + (\frac{1}{4} of \,7920 )\end{Bmatrix}]$?
Answer & explanation
Correct answer: option 4
$1980 ÷ 9 + [-77 + \begin{Bmatrix}-1980 + (\frac{1}{4} of \,7920 )\end{Bmatrix}]$
= 220 + [ - 77 + {-1980 + 1980}]
= 220 + [ - 77 + 0]
= 143