1.0 link Rainbow Dash Network http://rainbowdash.net/ Gherkin ☑️ (thelastgherkin) http://rainbowdash.net/thelastgherkin http://rainbowdash.net/notice/876983 @<span class="vcard"><a href="http://rainbowdash.net/user/1768" class="url" title="Lelouch I grapes"><span class="fn nickname">princesstwilight</span></a></span> If 2/9 of 3/8 are metamorphic, that is 1/12 of the whole. This is equal to 8/96. The portion that is igneous is 60/96. This means the remaining (sedimentary) portion is 28/96. If there are 48 more igneous than sedimentary rocks, 48 = 32/96. Seeing as this is one third of the whole, the total amount of rocks is 48 x 3 = 144. Pinkie would have to throw 144 individual parties if each rock has an individual birthday.