Which two sings should be interchanged to make the following equation correct?
$ 18 -23 \times 455 \div 7 + 28 = 377 $

Option
a) ÷ and −
b) – and  +
c) – and ×
d)  + and ×

Solution :

Check one by one
(a) interchange $ \div $ and –
$ 18 \div 23\times 455 – 7 + 28 $ : Not correct
(b) – and +
$ 18+23\times 455 \div 7 – 28 = 1485 $ : Not correct
(c) – and ×
$ 18\times23 – 455 \div 7 +28 $
414 – 65 + 28 = 377 : Correct

Correct Answer: c) – and ×