Question

The total number of rs5 and rs10 coins in my bag is 20. If I have rs145 in my bag. Let's calculate the number of coins of each kind I had in the bag

Answer 1

Answer:

5rs coins are 11 and 10 rs coins are 9

number of 5 rs coins as a and 10 rs coins as b

so 5a + 10b = 145

and a + b = 20

eq1

5a + 10b = 145

5(a + 2b) = 145

a + 2b = 145/5

a + 2b = 29

and a + b = 20

solving both a = 9

and then b = 11