SOLUTION: Sunil has Rs.240 in 10 rupee and 5 rupee notes. If there are 30 notes in all ? How many notes of each denominations are there ?

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Question 1052496: Sunil has Rs.240 in 10 rupee and 5 rupee notes. If there are 30 notes in all ? How many notes of each denominations are there ?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the number of 10R notes, B the number of 5R notes,
A%2BB=30 <--- Total number of notes
.
.
10A%2B5B=240 <--- Total value of notes
2A%2BB=48
Subtract the first equation from this one,
2A%2BB-A-B=48-30
A=18
So then,
18%2BB=30
B=12