Mathematical operation and symbol notation
Direction: Correct the following equations by interchanging the two signs.
 16  21 ÷ 7 x 6 + 3 = 31

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Lets try all options one by one.
Correct Option: B
If we interchange of signs '+' and 'x', then the equation changes into
16  21 ÷ 7 + 6 x 3 = 16  3 + 18 = 31
 5 x 15 ÷ 7  20 + 4 = 77

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Lets try all options one by one.
Correct Option: C
If we interchanges signs '+' and '÷', then the equation changes into
5 x 15 + 7  20 ÷ 4 = 5 x 15 + 7  5 = 77
 4 x 2 + 6 ÷ 2  12 = 2

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Lets try all options one by one.
Correct Option: A
If we interchanges signs '÷' and 'x', then the equation changes into
4 ÷ 2 + 6 x 2  12 = 2 + 12  12  2
 3  9 x 27 + 9 ÷ 3 = 3

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Lets try all options one by one.
Correct Option: E
If we interchange 'x' and '' , the equation changes into
3 x 9  27 + 9 ÷ 3 = 27  27 + 3 = 3
 if 'R' means '÷', 'Q' means 'x', 'P' means '+', then 1 8 R 9 P 2 Q 8 = ?

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Using the correct symbols, we have
1 8 R 9 P 2 Q 8
= 18 ÷ 9 + 2 x 8
Correct Option: A
Using the correct symbols, we have
1 8 R 9 P 2 Q 8
= 18 ÷ 9 + 2 x 8
= 2 + 2 x 8 = 2 + 16 = 18