a purse contains some Rs 5 coins and some Rs 10 coins. if the total number of these coins is 20 and the total value of these coins is Rs 165; find the number of Rs 10 coins in the purse.
aayushsuperman:
Its dam easy!!
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Answered by
8
Let the total no. of
Rs 10 coins be x.
Hence no. of Rs 5 coins=20-x
Value of
Rs. 10 coins=10x
Rs. 5 coins=5(20-x) =100-5x
A\Q, 10x+100-5x=165
5x=165-100
X=65/5=13
Hence, the no.
of Rs 10 coins=x=13
Rs 5 coins=20-13=7
Hence no. of Rs 5 coins=20-x
Value of
Rs. 10 coins=10x
Rs. 5 coins=5(20-x) =100-5x
A\Q, 10x+100-5x=165
5x=165-100
X=65/5=13
Hence, the no.
of Rs 10 coins=x=13
Rs 5 coins=20-13=7
Answered by
0
total number of rs10 coins are 13
as 13*10=130. and coins left are 7 coins
so theywould be of rs 5 coins as 5*7=35
and 13+7=20 130+35=165
as 13*10=130. and coins left are 7 coins
so theywould be of rs 5 coins as 5*7=35
and 13+7=20 130+35=165
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