Question 1201510
Roslinda's monthly pocket money was 3/5 of Sheela's monthly pocket money. 
Sheela's pocket money  be x
Roslinda's pocket money will be 3/5 x



Sheela's expenditure be y 
Roslinda's  expenditure was 7/12 y


 Roslinda's monthly pocket money was 3/4 of Sheela's expenditure.
3/5 x =3/4 y
Roslinda's saving = 3/4 y -7/12 y= 1/6 y................1
 
3/5 x =3/4 y
x= 15/12 =5/4 y
Sheela's saving = x-y => 5/4 y - y = y/4 ---------------2


(Roslinda's saving) / (Sheela's saving) ={{{ ((1/6)* y) / ((1/4)* y)}}} = 2/3

 Roslinda saved $11.20,
Roslinda's saving  1/6 y
11.20*6=y
y=67.20 (Sheela's expenditure)
x= 5/4 y

x= 5/4 *67.20 
x = 84 Sheela's pocket money

Roslinda's pocket money = 3/5 * x => 3/5 * 84 = 50.4