I need to check my answer

Question

The drama club earned $1040 from a production. 

They sold 64 adult tickets and 132 student tickets. 

An adult ticket costs twice as much as a student ticket.

What is the price of each type of ticket sold? (Use a for adult tickets and s for student tickets. 

Answer 1

64a +132s = 1040

a =2s

64(2s) + 132s = 1040

128s +132s = 1040

260s = 1040

s= 1040/260 = 4

s = $4 per adult

a =2s = $8 per student

64(8)+132(4)= 512+528 = 1040