Question

After paying 5.12 dollars for a salad, Norachai has 27.10 dollars. How much money did you have before buying the salad?

Answer 1

Hint: Assume the total money Norachai had before buying the salad as x dollars. Now, subtract the cost of salad from x dollars and equate it equal to the amount left after buying the salad. Form a linear equation in the variable x and solve it to get the answer.

Complete step by step solution:
Here we have been provided with the cost paid by Norachai for buying the salad and the amount left with him after the payment. We are asked to find the money he had before buying the salad.
Let us assume that before buying the salad Norachai had x dollars with him. Since he paid 5.12 dollars for the salad that means we need to subtract 5.12 from x which will be equal to the amount left with him after buying the salad which is given as 27.10 dollars. So forming a linear equation using the given information we get,
$\begin{align}
  & \Rightarrow x-5.12=27.10 \\
 & \Rightarrow x=27.10+5.12 \\
 & \therefore x=32.22 \\
\end{align}$
Hence, before buying the salad Norachai had 32.22 dollars with him.

Note: Here we do not need to convert dollars into INR. This question is an example of a linear equation in one variable and it required simple arithmetic operations like: addition and subtraction to solve. You need to understand the words of question carefully otherwise you may make a mistake in using the arithmetic symbols.