( 1- 1/4)*[ 1/2 * x+ 1/3 *(y+ 1/2 * x)]= 675( 1)
1/4 *[ 1/2 * x+ 1/3 *(y+ 1/2 * x)+( 1- 1/3)*(y+ 1/2 * x)= 1325(2)
From ( 1): 2x+y=2700 (3)
From (2): 2x+3y=5300 (4)
(4)-(3):
y= 1300 (5)
Replace (3) with (5):
x=700
A: At first, Xiaoming 700 yuan, Xiaohong 1.300 yuan.