To clarify, let's use abbreviations: J for Justin, E for Eva, and M for Emma. Then, J = E + 7.50 and M = J - 12. Along with that, J + E + M = 63. You can substitute M into the third equation using the second equation and arrive at: J + E + J - 12 = 63. Simplifying gives us: 2J + E = 75. Since J equals E + 7.50, substitute that into the equation to find: 2(E + 7.50) + E = 75. This leads to 2E + 15 + E = 75, simplifying to 3E + 15 = 75, hence 3E = 60 which implies E = 20; therefore, Eva has $20. Justin has $7.50 more than Eva, totaling $27.50. Emma has $12 less than Justin, coming to $15.50. Verify by ensuring their totals sum to 63, which they do.
