Question

I have 20 coins of 5 rupees and 10 rupees in my bag. If there is a total of 145 rupees in the bag, we calculate how many coins there are​

Answer 1

Step-by-step explanation:

let the no. of 5rupees coin be x

so,the no. of 10 rupees coin 20-x

a/q,

5x+ 10(20-x)=145

=> 5x+200-10x=145

=> -5x=145-200

=> -5x= -55

=> x=-55/-5

=> x=11

So,no. of 5rupees coin be x is 11

then,no. of 10rupees coin 20-x is 20-11=9

CHECK

LHS

= 5x+10(20-x)

= 5×11+10(20-11)

= 55+10×9

= 55+90

= 145✓

RHS

= 145✓

so,LHS=RHS verified