11.25 - 2.75 = 8.50
174 - 72 = 102
102 / 8.50 = 12
They bought 12 tickets
1000 millilitres = 1 litre
soda= 2 litres
apple juice = 2.5 litres
fruit punch = 1.5 litres
lemonade = 2 litres
2+2.5+1.5+2= 8 litres
10 - 8 = 2 litres
so, the combinations could be:
2 soda, 1 apple juice, 1 fruit punch and 1 lemonade
or
1 soda, 1 apple juice, 1 fruit punch and 2 lemonade
1.679 kg * (40 min)/(kg) + 20 min = 67.16 min + 20 min = 87.16 min