CBSE Class 9 Answered
In an envelope there are some 5 rupee notes and some 10 rupee notes. Total amount of these notes together is 350 rupees. Number of 5 rupee notes are less by 10 than number of 10 rupee notes. Then find the number of 5 rupee and 10 rupee notes.
Asked by atharvnikam123 | 15 May, 2019, 12:37: PM
Expert Answer
Let the number of 5 rupee notes be x and 10 rupee notes be y.
Total amount of these notes is 350 rupees.
→ 5x + 10y = 350 .... (i)
Number of 5 rupee notes are less by 10 than twice number of 10 rupee notes.
→ x = 2y - 10
→ x - 2y = -10 .... (ii)
Multiply (ii) by 5, we get
→ 5x - 10y = -50 .... (iii)
Adding (i) and (iii), we get
10x = 300
x = 30
Put x = 30 in (ii), we get
y = 20
Therefore the number of 5 rupee notes are 30 and 10 rupee notes be 20.
Answered by Yasmeen Khan | 15 May, 2019, 12:59: PM
