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Solving a system of linear equation in two variables

If + means ...

Question

If $+$ means $\times, -$ means $\div, \times$ means $+$ and $\div$ means $-$ are considered then find the value of
$10 \times 18 - 9 + 3 \div 1$ .

A

15

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B

20

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C

68

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D

180

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Solution

The correct option is A $15$
If you replace the given equation by modify sign. Then it will look like
$10 + 18 \div 9 \times 3 - 1$
$10 + 2 \times 3 - 1$
$10 + 6 - 1 = 15$

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