Question

2)
A certain number of two-rupee coins and a certain number of five rupee coins in a piggy
bank of a child amount of Rs.47. If the number of each kind are interchanged, they would
amount to Rs.3 less than before. Find the number of coins of each kind.
please help​

Answer 1

Step-by-step explanation: let number if 2 rupees coin be =x

Number of 5 rupee coin be =y

Then

2x+5y=47...eq1

2y+5x=44...eq2

Then solve both the equation

2x+5y-47 =0 eq..3 multiply by 5

2y+5x-44 =0 eq...4 multiply by 2

So

10x+25y-235=4y+10x-88

(10x-10×)+21y=-88+235

21y=147

y=147/21=7...eq5

Place eq 5 in eq1

2x+5 (7)-47=0

2x+35-47=0

2x=12

×=6

Means 6 2rupee coins and 7 5 rupee coins

I HAVE WRITTEN A LOT FOR THE FIRST TIME SO PLEASE MARK IT BRAIN LIST

Answer 2

ANSWER:

Step-by-step explanation: let number if 2 rupees coin be =x

Number of 5 rupee coin be =y

Then

2x+5y=47...eq1

2y+5x=44...eq2

Then solve both the equation

2x+5y-47 =0 eq..3 multiply by 5

2y+5x-44 =0 eq...4 multiply by 2

So

10x+25y-235=4y+10x-88

(10x-10×)+21y=-88+235

21y=147

y=147/21=7...eq5

Place eq 5 in eq1

2x+5 (7)-47=0

2x+35-47=0

2x=12

×=6

SO THE NO OF 2 RUPEE COINS ARE 2(6)=12 COINS

5 RUPEE COINS ARE ;7(5)=35 COINS