Math Makes My Brain Smoke
January 14, 2010 8:10 PM Subscribe
OMG it turns out I really do need to know algebra. Mr. Farnsworth, you were right: I should have paid better attention in math class!
posted by BlahLaLa to shopping (17 answers total) 1 user marked this as a favorite
This is not homework, it's just something that has been making me curious and & I want to figure it out. Because I'm a stay-at-home mom and I don't have enough things to think about, apparently.
It's a word problem, so here goes:
I went to the store and bought two large containers of shampoo and conditioner. They are each one liter/33.8 ounces. When I shampoo, I use 2 squirts from the shampoo's nozzle. When I condition, I use 5 squirts from the conditioner's nozzle. I assume each squirt dispenses the same amount of product; I like to use more conditioner than shampoo. So here it is, several months later, and I have run out of conditioner while still having plenty of shampoo left.
So, some questions:
1. How can I mathmatically work out how much more quickly I use up the conditioner than the shampoo?
2. If I wanted to go to the store and buy enough bottles of shampoo and conditioner to make it equal -- that I would eventually finish the last bottles of both at the same time -- how would I do that?
I'm interested in knowing the answers, and getting an idea of how this problem is worked out so I can figure out important stuff like this in the future.
Also, I was good at big picture stuff like physics, but I somehow always got lost with the basics. I still don't know how to do fractions, and I'm rusty with my times table. I plan on re-learning this along with my kid as he grows.