The recipe makes 6 portions and you need 18 portions. Since 6 is 3 times smaller than what you need, just times everything you've been given by 3.
<em>*you can choose to convert into the correct units of measurement before or after dividing. I converted after dividing. Either way works fine though.</em>
1) 60 x 3 = 180 ml
2) 80 x 3 = 240 g
3) 450 x 3 = 1350 g
<em>They want it in kilograms, so divide it by 1,000 to convert. this gives you 1.35 kg.</em>
4) 600 x 3 = 1800 ml
<em>They want it in l, so divide it by 1,000 to convert. this gives you 1.8 l.</em>
