Mathematical Op...

If 'a' means '+', 'd' means ′÷′,'m' means′×′, 's' means ′−′,'e' means '=', 'g' means '>', ′ℓ′, means '< then which one out of the following four is correct ?

 If the signs '+' and ′−′are interchanged and the numbers 3 and 5 are also interchanged, then which one out of the following four alternatives is correct?

If the signs ′×′and ′÷′as well as the numbers 10 and 20 are interchanged, then select the correct one alternative out of the following four.

If the signs ′×′ and ′−′and numbers 6 and 3 are interchanged, then which one of the following equations is correct?

16 + 4 ÷ 2 − 21 × 7 = 21 The above equation is incorrect. Which one out of the following interchanges would correct it?

The interchanges in the digits 9 and 4, and in the signs ′÷′and ′×′would make true which one of the following expressions?

If the interchanges in the digits 2 and 7 and in the signs ′×′ and '+' occur, then which of the following inequalities will be true?

If the sign '=' is replaced with '<' and the sign '<' is replaced with '=' and the signs ′×′ and'+' are interchanged, then which of the following statements would become true?

If the digits 4 and 5, and the digits 7 and 2 are interchanged, then compute the value of the expression 2 × 15 ÷ 7 − 15 + 45 − 54 ÷ 9