a sum of RS 400 is in the from of denomination of RS 5 and RS 10. if the total number of coins is 40 find the number of Rs.10 and Rs. 5 coins.
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Answer:
Let the number of ₹10 be X
₹5 be Y
A/Q
X+Y=40. ..Eq.1
10x+5y=400. ...Eq.2
Multiply Eq.1 with 5 and subract with Eq2.
10x+5y=400
5x+5y=200. (-)
__________
5x. =200
Therefore X= 40
Sub X=40 in Eq1
40+Y=40
Y=0
Terefore the number of ₹10 coins are 40 and ₹5 is 0
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