madhu has a total of ₹640 as currency notes in the denomination ₹50,₹20 and ₹10. the ratio of the number of ₹50 notes and ₹20 notes is 3:5. if she has a total of 30 notes , how many notes of each denomination has she ?
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Answer:
50 notes= 6
20 notes= 10
10 notes= 14
no of 50 notes = 3x
no of 20 notes = 5x
no of 10 notes = 30-(3x+5x)=30-8x
(50*3x) + (20*5x)+ 10(30-8x) = 640
150x + 100x + 300 -80x = 640
250x -80 x = 640-300
170x = 340
x = 340/170
x =2
50 notes = 3x = 3*2 =6
20 notes = 5x = 5*2 =10
10 notes = 30-8x = 30-8*2 = 30-16 = 14
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