### Home > CCG > Chapter 2 > Lesson 2.2.2 > Problem2-78

2-78.

Flo thinks she may be able to increase sales if she makes a big show of flipping pancakes at her diner. But flipping pancakes high in the air takes a lot of practice!

1. After flipping $35$ pancakes, only $22$ landed correctly on the grill. What is the probability (expressed in percent) of Flo correctly flipping a pancake?

$\large \frac{\text{# of pancakes landed}}{\text{total # of pancakes}}$

2. Flo needs $42$ pancakes for a large hungry group that just arrived. How many pancakes should she attempt to flip so that $42$ flip correctly?

$\frac{22}{35}=\frac{42}{p}$
She needs to attempt about $67$ pancakes.
3. A customer orders a side of “Flo’s grab bag of flapjacks” in which a customer gets one randomly chosen pancake. Flo has prepared a pan of $12$ sourdough pancakes and $15$ buttermilk pancakes. How many banana pancakes should Flo add to the pan if she wants the probability of randomly grabbing one banana pancake to be $\frac { 1 } { 10 }$?
How many pancakes does she have total? How many does she need to achieve a ratio of $\frac{1}{10}$?