An exercise book and two pens cost 90.00. If the difference between the cost of an exercise book and a pen is 45.00.determine the cost of a pen

Question

Exercise book, 2 pens, difference of items cost of items etc

Answer 1

Hello Precious,

From the first sentence, we can write

E + 2P = 90 {Eq 1}.

 

From the second sentence, we get

E - P = 45,

→ E = 45 + P {Eq 2}.

 

Substituting {Eq 2} in to {Eq 1}, we have

45 + P + 2P = 90

→ 3P = 45

→ P = 15

→ E = 60

 

So a pen costs $15 and an exercise book costs $60.

 

Thank you for posting the question.

Michael E.