Question

Han-ming bought two hamsters. For each day after the fist day ofthe week, the hamsters ate 20g more than the previous day. The hamsters grew fast, finishing 1260g of food in the first week. How much food did the hamsters eat on the first day?

Answer 1

x = the amount the hamsters ate on the first day

`x + x+20 + x+40 + x+60+x+80+x+100+x+120 = 1260 \\ 7x+420=1260 \\ (7x+420)-420=(1260)-420 \\ 7x = 840 \\ (7x)/7 = (840)/7 \\ x=120`

The hamsters were fed 120g of food on the first day. Hope this helps!