Cake quantity = 168/4.8=35 (blocks)

Each cake needs 2.6 grams of colored cream ***35 cakes.

Color cream =35*2.6=9 1 (g)

2. The water consumption is less than 20 tons, and the price per ton is 1.5 yuan.

20* 1.5=30 (yuan)

The water fee paid by Xiaoli's family in June 5438+ 10 is 46.8 yuan, and the part exceeding 20 tons is 2. 1 yuan, so (46.8-30)/2. 1=8 (tons).

* * * Water consumption 20+8=28 (ton)