Mathematical Operation
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21 If "–" stands for "÷", "+"stands for "x", "÷" for "–" and "x" for "+", which of the following equations is correct?
22 Given intercharges : Signs + and x and numbers 4 and 5.
23
If "#" means "subtraction", "&" means "division", "@" means "addition" and "%" means "multiplication" then
516 & 6 # 11 @ 50 % 4 = ?
24 If "A" denotes "subtracted from", "B" denotes "added to", "C" denotes "divided by", "D" denotes "multiplied by", then which of the following statement is correct?
25
In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?
642 x 6 ÷ 25 + 4 = ?
26 If "–" means "added to", "+" means "divided by", "÷" means "multiplied by", "x" means "subtracted from", then 13 + 12 x 9 ÷ 3 – 6 = ?
27 If "–" means "divided by", "+" means "multiplied by", "÷" means "added to", "x" means "subtracted from", then 11 ÷ 6 – 2 + 5 x 3 = ?
28 If the signs + and / and the numbers 2 and 4 are interchanged, which one of the following four equations would be correct?
