10 friends went for a dinner. The bill amounted to ₹2700. Some of them gave ₹300 towards the bill and some gave ₹200. How many gave ₹200.
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So,
Let us assume that x persons gave 200 rupee notes and y persons gave 300 rupee notes
Now,
There were in together 10 friends so,
x + y =10..................1)
Also if we equate the amount spend on 200 and 300 rupee notes then
200x +300y = 2700........................2)
Multiplying equation 1) by 200 and then substracting by 2) we get
300y - 200y = 2700 - 2000
100y= 700
y=7
Substituting y=7 in equation 1) we get,
x + 7= 10
x=3
So,
3 person spent 200 rupee notes and 7 spend 300 rupee notes
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