Coding and Decoding Questions

In this question, some equations are solved on the basis of a certain system. On the same basis find out the correct answer from amongst the four alternatives for the unsolved equation.

462 = 551
398 = 487
856 = ?

If "*" denotes "added to", "&" denotes "divided by", "@" denotes "multiplied by" and "%" denotes "subtracted from", then 136 & 8 @ 7 % 3 * 7 = ?

In a certain coding language, 'Ginger is a root' is written as 4123, 'A tree has a root' is 75422 and 'Tree is green' is 385. Which digit represents 'root'?

In a certain code language, "FIRST" is written as "@#$!?" and "EYE" is written as "^*^". How is "TYRE" written in that code language?

If "A" denotes "added to", "B" denotes "divided by", "C" denotes "multiplied by" and "D" denotes "subtracted from", then

76 B 19 C 7 A 3 D 25=?

If 9*4 = 26, 4*4 = 16 and 3*6 = 18, then find the value of 5*2 = ?

If the code for MOTHER is JRQKBU then what is the code for PRINCIPAL?

If "+" means "minus", "x" means "divided by", "÷" means "plus" and "-" means "multiplied by", then 126 x 14 + 7 - 3 ÷ 2 = ?