If ‘+’ means ‘divided by’ ‘-’ means ‘added to’ ‘x’ means ‘subtracted from’ and $$‘\div’$$ means ‘multiplied by’ then 26-15+5 x 4$$ \div 2=?$$

The safest way to do such questions would be to write the numbers by removing the operators between them, Now insert the operators according to their new meanings. Now use BODMAS rule to calculate the result.

26 15 5 4 2, Now inserting the operators, we get

26 + 15 $$\div$$ 5 - 4 x 2, so we have
26 + 3 -8
21
So the correct option is option 5.

(BODMAS is the rule which specifies the preference of operators. It means, bracket -> of-> division->multiplication->addition->subtraction)