The answer si:
- 18 servings - 6 oz of salmon
- 36 servings - 12 oz of salmon
- 90 servings - 30 oz of salmon
- 100 servings - 33.33oz of salmon
1 roll is 9 servings and it is also made of 3oz of smoked salmon. That means that 3oz of smoked salmon is needed for 9 servings.
Now, let's made some proportions:
16 servings:
3 oz is for 8 servings, how much oz is for 18 servings:
3 : 9 = x : 18
x = 3 · 18 ÷ 9 = 6 oz
36 servings:
3 oz is for 9 servings, how much oz is for 36 servings:
3 : 9 = x : 36
x = 3 · 36 ÷ 9 = 12oz
90 servings:
3 oz is for 9 servings, how much oz is for 90 servings:
3 : 9 = x : 90
x = 3 · 90 ÷ 9 = 30 oz
100 servings:
3 oz is for 9 servings, how much oz is for 100 servings:
3 : 9 = x : 100
x = 3 · 100 ÷ 9 = 33.33 oz
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