Question

Guillermo bought textbooks and notebooks at the bookstore. The number of textbooks was $3$ more than twice the number of notebooks. He bought $7$ textbooks. How many notebooks did he buy?

Short answer

He bought$2$ notebooks.

Step-by-step solution

Step 1. Given information.

Consider the given question,

No. of textbooks was $3$more than twice the number of notebooks.

No. of textbooks bought is $7$.

Assume nto be the no. of notebooks. Then,

role="math" localid="1647074164097" $$\begin{gathered} 7=3+2n \\ 2n=4 \\ n=2 \end{gathered}$$

Step 2. Check the answer.

Consider the given question,

We know there are $7$notebooks which was $3$more than twice the number of $2$notebooks.

Then,

$$\begin{gathered} 7=3+2\left(2\right) \\ 7=3+4 \\ 7=7 \end{gathered}$$

Hence,$LHS=RHS$and proved.