Project 5

Transcript

00:00

What is 35% of 90?

00:02

Start by making 35% a fraction.

00:06

35/100 and simplified to 7/20.

00:11

Now you can just multiply 7/20 x 90.

00:17

7/20 x 90/1 = 630/20 and simplify that to 31.5 by dividing 20 into 630.

00:26

So we end up with 35% of 90 is equal to 31.5.

00:36

Now let's find the unknown value.

00:38

35% of what number equals 31.5?

00:48

Make 35% a fraction of 35/100 and simplified to 7/20.

00:55

That gives us 7/20 - X = 31.5  with X as the unknown value.

01:05

Get X alone by dividing both sides by 7/20 to get X = 31.5 / (7/20)

01:09

Flip and multiply.  X = 31.5/1 x 20/7

01:15

That gives X = 90. So 35% of 90 equals 31.5!