Question

. A memory card manufacturing facility estimates that four out of 500 cards are faulty. About
how many faulty memory cards can be expected for every 1,200 that are manufactured?

Answer 1

a) set up a
proportion, defining a variable for the unknown quantity, b) solve the proportion, showing all work
leading to your answer, and c) write a sentence to explain the meaning of the answer for the
situation.

Answer 2

Set this one up like the one about the medication. Do a ratio with 4 bad cards in the numerator of one ratio and 500 good cards in the denominator. What you are looking for then is how many bad cards can you expect, x, to be found in 1200 cards.

Answer 3

The proportion, or ratio, is this:

Answer 4

x is your variable for the number of faulty cards out of 1200.

Answer 5

Solve it by cross-multiplying.
4(1200) = 500x

Answer 6

What is x?

Answer 7

9.6?

Answer 8

@IMStuck