raj has a sum of rs.800m in the form of denomination of rs.10 and rs.20. if the total number of notes be 50,find the number of notes of each type.
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Let the total number of ₹10 note be "x"
If we subtract 10 rupee note from 50 we will get the number of ₹20 notes
So ₹20 note be=(50-x)
10x +20(50-x)=800
10x+1000-20x=800
-10x=-200
x=20
Raj has 20 ₹10 notes
So now ₹20 notes = 50-20=30
10*20=200
20*30=600
200+600=800
Thus he has 20 ₹10 note and 30 ₹20 note.
If we subtract 10 rupee note from 50 we will get the number of ₹20 notes
So ₹20 note be=(50-x)
10x +20(50-x)=800
10x+1000-20x=800
-10x=-200
x=20
Raj has 20 ₹10 notes
So now ₹20 notes = 50-20=30
10*20=200
20*30=600
200+600=800
Thus he has 20 ₹10 note and 30 ₹20 note.
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