mary and evelyn had $1500 each for shopping.Mary bought 3 skirts at $168 each,a handbag for $391 and 11 similar blouses. evelyn bought 3 identical blouses, a handbag for $285,a pair of shoes for $186 and 24 similar shirts.

a)if mary had $264 left , how much did each blouse cost?

Mary
bought --> 3 skirts for $168 each + 1 handbag for $391 + 11 blouses
$1500 - $504 - $391 --> 11 blouses + $264 left
11 blouses --> $605 - $264
11 blouse --> $341
1 blouse --> $31

b)How much did each shirt cost?
Evelyn
bought --> 3 blouses for $31 each + 1 handbag for $285 + 1 shoes for $186 + 24 shirts
$1500 - 3 x $31 - $285 - $186 + 24 shirts
24 shirts --> $936
1 shirt cost $936 / 24
1 shirt cost $39

For (a), we'll have to deduct the amount mary had left before finding the cost of each blouse. Therefore, each blouse cost $31 and each shirt cost $39.

a)if mary had $264 left , how much did each blouse cost?

Mary
bought --> 3 skirts for $168 each + 1 handbag for $391 + 11 blouses
left --> $264

$1500 - $504 - $391 - $264 --> 11 blouses
11 blouses --> $341
1 blouse --> $31

b)How much did each shirt cost?
Evelyn
bought --> 3 blouses for $31 each + 1 handbag for $285 + 1 shoes for $186 + 24 shirts
$1500 - 3 x $31 - $285 - $186 + 24 shirts
24 shirts --> $936
1 shirt cost $936 / 24
1 shirt cost $39

sorry for my mistake. i fix my problem like you say

You are most welcome