A sum of rs. 800 is in the form of denominations of rs. 10 and rs. 20 each. If the total number of notes is 50, find the number of notes of each type.
Please give the answer in one variable type (Grade 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= 200/10=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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