Answer
Required quantity: $\frac{3}{4}$ cup margarine, $7\frac{1}{2}$ tbs sugar, $1\frac{1}{2}$ cup orange juice, $5$ tsp lemon juice, $2\frac{1}{2}$.
tbs grated orange rind, $1\frac{1}{2}$ tsp grated lemon rind, and $1\frac{1}{2}$ cup toasted slivered almonds.
Work Step by Step
The total number of required crepes is $5\times 8 = 40$.
The ratio between the required crepes and the given crepes is $40:16 = 5:2 = 2.5$. So, to get the required number of crepes, multiply original ingredient quantity with $2.5$. So, we need $\frac{3}{4}$ cup margarine, $7\frac{1}{2}$ tbs sugar, $1\frac{1}{2}$ cup orange juice, $5$ tsp lemon juice, $2\frac{1}{2}$.
tbs grated orange rind, $1\frac{1}{2}$ tsp grated lemon rind, and $1\frac{1}{2}$ cup toasted slivered almonds.