1. The ratio of sugar to syrup is 1: 9, and the ratio of water to syrup is 8: 9, so sugar is 45×( 1/9)=5g, and water is 40g.

2. Do the same thing as above. If you are really not used to it, set flour X.

(300-x)/x=5/ 1

X = 50m X=50

The two methods and two problems can be common.