The Kingdom of Chemithia- Part 3

You head back home after going to Anilina's lab and see your mom waiting outside for you. You tell her about the test and she says that she is sure you will qualify. When you enter the house, your mom tells you she needs a little help.

Your mother works in the redox chemistry division of King Antimony's court, and she is constantly seeking to find new ways to react 2 substances. When you were gone, she was trying to react Oxalate ions ( $C_2O_4^{2-}$ ) with Permanganate Ions ( $MnO_4^{-}$ ) in order to form $Mn^{2+}$ ions, $CO_2$ and water. This reaction takes place in an acidic medium. The unbalanced equation is as follows:

$MnO_4^{-}$ + $C_2O_4^{2-}$ + $H^{+}$ -----> $Mn^{2+}$ + $CO_2$ + $H_2O$

However, your mother is unable to balance the reaction. What are the sum of the coefficients of the permanganate ion, the oxalate ion and the $H^{+}$ needed for this reaction?

This question is part of my set Tales of Chemithia ! Give it a try; it's a story woven together by Chemistry problems!