Answer:
160.
Step-by-step explanation:
Work out the innermost parentheses first:
{[9 x (7.3+10.7)} - 5} + [3 x (7.8 - 6.8)}
= {[9 x 18} - 5} + [3 x 1}
= {162 - 5} + 3
= 160.
