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In an experiment there are three containers E1, E2 and E3. A thermometer graduated on the X scale reads 10 oX when immersed in container E1, containing a mass M1 of water at 41 oF. The thermometer, when immersed in container E2 containing a mass M2 of water at 293 K, reads 19 oX. In container E3 there is initially a mass of water M3 at 10 oC. The masses of water M1 and M2, from containers E1 and E2, are transferred to container E3 and, at equilibrium, the temperature marked by the thermometer is 13 oX. Considering that there is only heat exchange between the masses of water, the ratio M1 M2 is: