Mathematical operation and symbol notation
 If '' stands for '÷', '+' stands for 'x', '÷' stands for '' and 'x' stands for '+', find out which one is correct?

 49 + 7  3 x 5 ÷ 8 = 20
 49  7 + 3 ÷ 5 x 8 = 24
 49 x 7 + 3 ÷ 5  8 = 16
 49 ÷ 7 x 3 + 5  8 = 26

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Try All option one by one
Correct Option: B
From option (b),
49  7 + 3 ÷ 5 x 8 = 24
Change the sign, as per the question,
49 ÷ 7 x 3  5 + 8 = 24
⇒ 7 x 3  5 + 8 = 24
⇒ 21  5 + 8 = 24
∴ 24 = 24
 Select the correct combination of mathematical signs to replace '*' signs and to balance the following equation.
6 * 4 * 12 * 12

 ÷, , =
 +, , ÷
 =, , ÷
 x, , =

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Try all option one by one.
Correct Option: D
6 * 4 * 12 * 12
From option (d),
6 x 4  12 = 12
⇒ 12 = 12
 If 'x' stands for '+', '<' for '', '+' for ' ÷', '>' for 'x', '' for '=', ' ÷' for '>' and '=' for '<', then state which of the following is true ?

 3 x 4 > 2  9 + 3 < 3
 5 x 3 < 7 ÷ 8 + 4 x 1
 5 > 2 + 2 = 10 < 4 x 8
 3 x 2 < 4 ÷ 16 > 2 + 4

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Using the proper symbols in question and solve all option one by one.
Correct Option: C
Using the proper symbols in (c), we get
5 x 2 ÷ 2 < 10  4 + 8
⇒ 5 x 1 < 18  4 ⇒ 5 < 14
which is true.
 If '' stands for '÷', '+' stands for '', '÷' stands for 'x', 'x' stands for '+', then which one of the following equation is correct?

 70  2 + 4 ÷ 5 x 6 = 44
 70  2 + 4 ÷ 5 x 6 = 21
 70  2 + 4 ÷ 5 x 6 = 341
 70  2 + 4 ÷ 5 x 6 = 96

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Change the proper sign according to question and try all option one by one by applying the BODMAS Rule.
Correct Option: B
Change the proper sign according to question and try all option one by one by applying the BODMAS Rule.
'' ⇒ ÷
'+' ⇒ ''
÷ ⇒ 'x'
'x' ⇒ '+'
∴ 70 ÷ 2  4 x 5 + 6 = 21
⇒ 35  20 + 6 = 21
⇒ 15 + 6 = 21
⇒ 21 = 21
 If '+' means '÷', '' means '+', 'x' means '' and '÷' means 'x', then what is the value of 24 ÷ 12  18 + 9 ?

 25
 0.72
 15.30
 290

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Using the proper symbols, we have
24 ÷ 12  8 + 9
Now Apply the BODMAS RuleCorrect Option: D
Using the proper symbols, we have
24 ÷ 12  8 + 9
Now Apply the BODMAS Rule,
= 24 x 12 + 18 ÷ 9
= 288 + 2 = 290