Suppose we write down the smallest (positive) $2$-digit, $3$-digit, and $4$-digit multiples of $7$.
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Total number of guests = 16
Solution:
Number of pizzas the caterer usually makes = 4
Number of pizzas the caterer make for a large party = twice of 4
= 2 × 4
= 8
So,the caterer makes 8 pizzas for a large party.
Quantity of pizza eat by each guest = of a pizza
Let the number of guests be taken as x.
Total guest in the party
= Total number of pizzas ÷ Amount of pizza eat by each guest.
⇒
Division changed into multiplication when the digit of the denominator is reversed.
⇒
⇒ x = 16
Hence pizzas served for 16 guests.