Question

Your piggy bank has a total of 43 coins in it; some are dimes and some are nickels. If you have a total of $3.60, how many dimes do you have?

Answer 1

Let no of dimes= d
let no of nickels= n

total coins in piggy bank ( n+d)= 43...(equation 1)
a dime = 10 cent
a nickel = 5 cent

equation 2: 5n+10d=360
equation 1: n+d=43

two equations and two variables now we can calculate the "d and n". after calculation
dimes(d)=29
nickels(n)=14