Question

for every 144 light bulbs produced, 6 are defective. find the number of defective light bulbs that could be expected out of 720.

Explanation:

Step1: Set up proportion

Let \(x\) be the number of defective bulbs in \(720\) bulbs. The proportion is \(\frac{6}{144}=\frac{x}{720}\).

Step2: Cross - multiply

Cross - multiplying gives \(144x = 6\times720\).

Step3: Solve for \(x\)

First, calculate \(6\times720 = 4320\). Then \(x=\frac{4320}{144}\).
Since \(4320\div144 = 30\).

Answer:

\(30\)