Problema Solution
Stefanie bought a pencil and received change for $6.00 in 20 coins, all nickels and quarters. How many of each kind are given?
Answer provided by our tutors
let the number of quarter coins be x
the number of nickels 20-x
so the euation is
0.25*x + 0.5(20-x) = 6
=>0.25x + 10 - 0.5x = 6
=>0.25x = 4
=>x = 16
thus number of silver coins = 16
number of nickels = 20-16=4