Pounds of cake needed:
[tex]\tt \dfrac{4}{15}\times \dfrac{14}{15}=\dfrac{56}{225}[/tex]
Flours left:
[tex]\tt \dfrac{14}{15}-\dfrac{56}{225}=\dfrac{210}{225}-\dfrac{56}{225}=\dfrac{154}{225}[/tex]
