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Forum URL: http://www.cut-the-knot.org/cgi-bin/dcforum/forumctk.cgi
Forum Name: Middle school
Topic ID: 95
Message ID: 1
#1, RE: Word problems
Posted by alexb on Feb-05-04 at 09:10 AM
In response to message #0
>Help me do these word problems.
>1.For every 150 seed you sow,97 germinate. At this rate, how
>many seeds will germinate if you sow 2550 seeds?
>
> n over 2550 times 97 over 150? or
> 2550 divided by 150 times 97 ?

The latter. But do please give a thought to why.

>====================================================
> 2. Spaghetti costs 79 cents for an 8 ounce box. Find the
>cost per ounce. Round to the nearest tenth of a cent.
>
> divide 8 into 79? = 9.875 or 10 cents per ounce
> is there a formular that I should use to find the
>cost per ounce?

It's the one you used.