Pls hellppp Sam bought 3 pairs of flipflops for $12.60. What would be the unit price?

$4.20 per pair of flipflops

Step-by-step explanation:

12.60 / 3 = 4.20

A)
50 minutes swimming a day
breast=y
butterfly=x

breast 20 minutes more than butterfly:
I: y=20+x

50 minutes a day:
II: 50=x+y

B)solve equation system:
substitute y=20+x into II:
50=x+(20+x)
30=2x
15=x

-> insert into I:
y=20+15
y=35
-> 35 minutes breaststrokes a day

C)No
if he had practiced butterflys for 45 min, breast would be at 65 min or in total 100 minutes and not the 50 per day he claims