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Kunal's suitcase lock opens only when the value of the expression on the screen equals the number on the note. Which value of a opens the lock?

Class 7Finding the Value of an ExpressionAlgebra

A13
B39
C29
D97

Step-by-Step Solution

We need

3 a - 5 = 34

, so

3 a = 39

and

a = 13

. Check:

3 \times 13 - 5 = 34

. 39 forgets to divide by 3; 29 subtracts 5 instead of adding it.

Answer: A) 13

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