Ana has a project, so she dicided to go to the store to buy some stuff. She notice that the amount of pen is twice as the amount of pencil and the amount of cardboard is a square of a pen . How much is the pen if the amount of pencil is 5 pesos? How about the cardboard? How much is her change if she pays on the cashier 100 pesos.
Let the pencil be X , pen as Y and Cardboard as Z.
ThenX+Y+Z = N
100-40 = change
The pen is Php. 10.00 the cardboard is Php 25.00
Then shes change is Php 60.00 if she has 100.00