Question

2 vampiri sug in 2 min 2 l de sânge ... 10 vampiri sug in 10 min x l de sange

Answer 1

2 vampiri ---------- 2 minute --------  2 litri
1 vampir    -------- 2 minute --------- = 2: 2 = 1 l itru
1 vampir -----------10 minute --------- = 10 x 1 l = 10 litri
10 vampiri ----------10 minute -------- = 10 x 10 l = 100 litri