A sum of rupees 800 is in the form of denominations of rupees 10 and rupees 20. If the total number of notes be 50,find the number of notes of each type.
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Step-by-step explanation:
⇒ Let the number of notes of Rs.10 be x
∴ The number of notes of Rs.20=50−x
According to the given condition,
⇒ 10x+20(50−x)=800
⇒ 10x+1000−20x=800
⇒ −10x=800−1000
⇒ −10x=−200
∴ x=
10
200
=20
∴ The number of notes of denomination of Rs.10=20
⇒ The number of notes of denomination of Rs.20=50−20=30
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