Question

90-[90-{45+(45÷15)}]​

Answer 1

Answer:

90_(90-(45+(45÷15)))

90-(90-(45+3))

90-(90-48)

90-42

48

Answer 2

$90-[90-{45+(45 \div 15)}] \\ 90 - [90-{45+3}] \\ [90-42] \\ 48$

Using formula

BODMAS

bracket of division, multiplication and subtraction.

bracket first we solve small bracket then curly bracket and at last big bracket.