13. A sum of 800 is in the form of denominations of 10 and 20. If the total numbers notes is 50, find the number of notes of each types
Please try to give answer in level of class 7
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⇒ 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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