i need help solving this problam

Question

A man ordered

4

times as many boxes of ballpoint pens as boxes of​ felt-tip pens. Ballpoint pens cost

​$4.42

per​ box, and​ felt-tip pens cost

​$3.44.

If the​ man's order of pens totaled

​$63.36​,

how many boxes of each type of pen did he​ buy?

Answer 1

B=4F

4.42B + 3.44F = 63.36

4.42(4F) + 3.44F = 63.36

17.68F + 3.44F = 63.36

21.12F = 63.36

F = 63.36/21.12 = 3 boxes of Felt tip pens

B = 4(3) = 12 boxes of Ball point pens

check the answers

4.42(12) + 3.44(3) = 53.04 + 10.32 = 63.36