Question

nalini hasan amount of 20 rupees in coins of denominations of 50 paise and 1rupee.if she has a total of 30 coins with her ,how many1 rupee coins does she have​

Answer 1

Answer:

10

Step-by-step explanation:

let x be the number of 50p coins and y be the number of 1re coins

x+y=30 ----1

0.5x+1y=20 ----2

solving 1 and 2 (subtracting 2 from 1)

0.5x=10 => x=20

from 1 we know x+y=30 thus y=10

Answer: 10