Question

sudha had rupees 100 with her .she bought 7/2 litres of milk at rupees 45/2 per litre. how much money is left with her

Answer 1

to buy 7/2= 3.5litre
@45/2=22.5 rupees per litre
Money required to buy 3.5 litre
=3.5×22.5=78.75 rupees
left Money =100-78.75=21.75 rupees

Answer 2

to buy:- 7/2 = 3.5l.
cost per litre = 45/2 = 22.5.
cost for 3.5l = 45/2 × 7/2 = 315/4.
money left = 100- 315/4 = 21.25