Sau khi ban lan dau cua hang con: 1-3/4 = 1/4 (tong so kg gao)
Lan thu 2 cua hang ban duoc: 1/4 . 3/8 = 3/32 (tong so kg gao)
Goi x la tong so gao luc dau, ta co:
3/4x+3/32x+27 = x
27/32x +27=x
27 = x-27/32x =5/32 x
x= 27 :5/32 = 172,8
Vay: lac dau cua hang co 172,8 kg gao