00:01
We're told that a tv costs the same as five microwaves.
00:05
Three microwaves cost the same as eight blenders.
00:07
Twelve blenders cost the same as three rice cookers.
00:10
Two rice cookers cost $375 and we want to figure out how much do three tvs cost in dollars.
00:16
So we got a few equations we can write here.
00:19
A tv, so we'll let t represent the cost of a tv.
00:24
The cost of a tv is the same as five microwaves.
00:27
So we'll say 5 m where m is the cost of a microwave.
00:31
Then three microwaves, so 3m, that costs the same as eight blenders.
00:36
So we'll say 8b where b is the cost of a blender.
00:40
And then 12 blenders, so 12 times b, costs the same as seven rice cookers.
00:48
So we'll say 7r where r is the cost of a rice cooker.
00:54
And then two rice cookers, so 2r costs $375.
01:02
So we can easily solve that last equation we just wrote, 2r equals 375 to find the cost of a rice cooker.
01:12
So let's write that down here, 2r equals 375.
01:18
We can divide both sides by two and that gives us 375 divided by two, that gives us 187 .5.
01:31
That's the cost of a rice cooker.
01:33
And then going back to the previous equation, 12b equals 7r...