Question

Three binders and four notebooks cost a total if $4.32$. One binder and five note-books cost $3.97$. What is the cost of one notebook?

• A. $0.50$
• B. $0.69$
• C. $0.72$
• D. $0.79$

Answer 1

The correct option is B $0.69$

Let the cost of notebook be $a$ and the cost of binder be $b$
We have $4a+3b=4.32$ and $5a+b=3.97$
Multiply second equation with $3$ and subtract first equation from it
We get $11a=3.97\times 3-4.32=7.59$ , which implies $a=0.69$
The cost of notebook is $0.69$.