Algebra word problem NEED HELP

Question

Carlos has a change jar that contains only nickels and dimes. He has 64 coins which add up to a total of $3.95. How many of each type of coin does he have?

A) Enter an equation using the information as it is given that can be solved to find the solution to this problem. Use 

 as your variable to represent the number of nickels. Note: Your equation should not include any numbers that do not appear in the original problem

Equation = _______

He has _____ dimes

he has _____ nickels

Answer 1

n + d = 64

5n+10d = 395

5n + 5d = 5(64) = 320

subtract to get

5d = 75

d = 75/4 = 15 dimes

n = 64-15 = 49 nickels

check the answer

5(49)+10(15) = 245+150 = 395