<p>I normally don’t post up math questions but i guess im gona have to for this question. it seems hard.</p>
<p>In an assortment, 23 types contain oats and 25 types contain rice. Some of these cereals contain both oats and rice. If 16 cereals in this assortment contain oats but not rice, how many cereals contain rice but not oats?
Answer: 18.
I got 14 but obviousy it’s wrong.</p>
<p>23 contain oats
16 contain ONLY oats which means that 7 Contain oats AND rice (23-16=7)</p>
<p>if 25 types contain rice but 7 of them have oats and rice then there are only 18 which contain only rice (25-7=18)</p>
<p>Draw a Venn-diagram with two overlapping circles. Let the left circle represent oat and let the right circle represent rice. The overlapping region represents that which have both, and the exterior regions represent that which have only one.</p>
<p>Because the total value of the left circle is 23 and the value of the exterior region of the left circle is 16, we know the overlapping region is 7. And so, because the total value of the right circle is 25 and the overlapping region is 7, we know the exterior region of the right circle is 18.</p>
<p>Ok, but how do you know that in the 25 types of rice that there might not have been any both rice and oats as well? </p>
<p>I did pretty much the same as you did but i didn’t assume that even though there were 16 oats and not rice, and there was 7 that was both rice and oats, that there wasn’t any both rice and oats in the 25 types of rice assortment.</p>
<p>oh wait, nvm i understand it…wow this question was easy as hell!!! </p>
<p>ONCE AGAIN FRESH101 SUCKS AT LIFE B/C HE CAN’T *<strong><em>IN STOP MAKIN STUPID *</em></strong>TY MISTAKES!!! FMLLLLL</p>