M4maths Previous Puzzles

06 Oct 2022 Algebra

Which one set of operations when placed in blank places and performed sequentially will give the correct result ?
2 _ 4 _5 _ 9 _ 8 _ 5 _ 4 _ 2 = 0

OPtion

1) ÷ , - , - , x , - , + , x
2) - , + , - , ÷ , - , x , -
3) - , + , ÷ , x , - , + , ÷
4) ÷ , x , - , + , - , ÷ , +
5) ÷ , x , - , ÷ , - , + , x
6) x , + , - , ÷ , - , x , +
7) ÷ , + , - , + , - , x , +
8) x , - , + , ÷ , x , - , x
9) + , x , - , ÷ , + , x , -
10) None of these

Solution

Operations in given options when performed in sequence will give following results:
1) 2 ÷ 4 - 5 - 9 x 8 - 5 + 4 x 2 = -218
2) 2 - 4 + 5 - 9 ÷ 8 - 5 x 4 - 2 = -25
3) 2 - 4 + 5 ÷ 9 x 8 - 5 + 4 ÷ 2 = 0.833
4) 2 ÷ 4 x 5 - 9 + 8 - 5 ÷ 4 + 2 = 1.125
5) 2 ÷ 4 x 5 - 9 ÷ 8 - 5 + 4 x 2 = -3.625
6) 2 x 4 + 5 - 9 ÷ 8 - 5 x 4 + 2 = -16
7) 2 ÷ 4 + 5 - 9 + 8 - 5 x 4 + 2 = 0
8) 2 x 4 - 5 + 9 ÷ 8 x 5 - 4 x 2 = 7
9) 2 + 4 x 5 - 9 ÷ 8 + 5 x 4 - 2 = 28.5
Therefore, correct option is 7)

Correct Option: 7 Best Solution (0)