Jacks wild souvenirs shop is selling all shirts for $10 each and all flip flops for $5 per pair. at the end of one day jacks shirts and flip flops sales totaled $325 for $41 items. how many shirts and flip flops did jack sell?

Let x =  the number of shirts sold
Let y =  the number of pairs of flip flops sold

Because 41 items were sold, therefore
x + y = 41           (1)

Shirts sell for $10 each, and a pair of flip flops for $5 per pair (or $2.50 each). Total sales is $325.
Therefore.
10x + 5y = 325
or, divide by 5 to obtain
2x + y = 65      (2)

Subtract (1) from (2).
2x + y - (x + y) = 65 - 41
x = 24
From (1), obtain
y = 41 - x = 41 - 24 = 17

Jack sold 24 shirts and 17 pairs (or 34) of flip flops.