Answer:
[tex]\boxed{\boxed{\dfrac{\text{Number of minutes used on Saturday}}{\text{Number of minutes on Saturday and Sunday}}=\dfrac{2}{5}}}[/tex]
Step-by-step explanation:
On Saturday Alison used her cell phone for 36 minutes.
On Sunday she used he cell phone for 18 minutes more than Saturday, i.e 36+18= 54 minutes.
In total she used 54+36= 90 minutes on Saturday and Sunday.
So,
[tex]\dfrac{\text{Number of minutes used on Saturday}}{\text{Number of minutes on Saturday and Sunday}}=\dfrac{36}{90}=\dfrac{2}{5}[/tex]
