okok, one more forum game

it's easy:

poster 1: write a task (like 80x5-90=?)

poster 2: solve it and write a new task.

Rules:

You have to solve it without calculator!

Don't write it down, or use paper/pen. -Use your head

The task has to be solve able without calculator.

If noone can solve it in 48h, it's ok to use calculator, solve it, and write a new one.

ok, i'll start with an easy one:

5(12/2)+54=?