Question

If a car factory checks 320 cars and 12 of them have defects, how many out of 560 will have defects? Use proportions

Answer 1

Answer:

Total number number of cars which do not have defects = 539

and 21 are defected out of 560 i.e. 560 - 539 = 21

Step-by-step explanation:

Total cars checked by Car factory = 320

Number of defected cars = 12

The number of cars which do not have defects = 320 - 12 = 308

Total Number of cars = 560

So the equation becomes

$\left[560\:\times \:308\right]\:\div \:320$

⇒  $\frac{560\times \:308}{320}$

$\mathrm{Multiply\:the\:numbers:}\:560\times \:308=172480$

⇒  $\frac{172480}{320}$

$\mathrm{Divide\:the\:numbers:}\:\frac{172480}{320}=539$

⇒  $539$

Therefore, total number number of cars which do not have defects = 539

and 21 are defected out of 560 i.e. 560 - 539 = 21