21. A bag contains 1,600 in the form of 10 and 20 notes. If the ratio between the
numbers of 10 and 20 notes is 2: 3, find the total number of notes in all.
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Answer:
total 100 notes
Step-by-step explanation:
total amount is 1600
notes 10:20 = 2:3
Let the variable be x
therefore, no. of 10 Rs notes = 2x
no. of 20 Rs notes = 3x
value of 10 Rs note be 20x
value of 20 Rs note be 60x
therefore
20x + 60x =1600
80x = 1600
x =1600/80 = 20
no. of 10 Rs note = 2x = 40
no. of 20 Rs note = 3x = 60
therefore, total no. of notes = 40+60=100
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