Answer:
Sally is having 4 nickels.
Step-by-step explanation:
let the number of nickels Sally is having = x
and number of dimes she is having = y
We know dime represents 0.10 cents and nickel represents .05 cents
therefore y = 7 x ------(1)
0.10 x + .05 y = 3
10y + 5x = 300
2y + x = 60 -------(2)
By putting the value of y from equation 1 in equation 2
14x + x = 60
15x = 60
x = 60/15 = 4
y = 7×4 = 28
Sally is having 4 nickels.
