thiếu cách làm r
cần đổ thêm số phần trăm là
150/200*100=75%
Khối lượng muối trong 200 g nước muối là:
200 : 100 x 3,5 = 7 g
Khối lượng nước muối sau khi đã pha là:
7 : 2 x 100 = 350 g
Khối lượng nước thêm vào là:
350 – 200 = 150 g
150g dung 100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%
150 g dung 10000000000000000000000000000000000000000000000000000000000000000000000000000000000%
150 ca chac luon, ket bn nha mk lam roi dam bao dung lun