There are 400 coins in a jar. If there are only 5 pence and 10 pence coins with a value of £27.50 ; how many 5p and 10pcoins are there?

Answer 1

x+y=400

5x +10y= 2750 1 lb = 100 p

5x +5y = 2000

5y = 750

y = 750/5 = 150 10 pence coins

x = 250 5 pence coins

150+250 = 400 coins

5(250) + 10(150) = 1250+1500= 2750 = 27.5 lbs