ANSWERS: 1
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Let E, N, and T be the numbers of students eighteen, nineteen, and twenty, respectively. You are given three facts... E + N + T = 38 (18*E + 19*N + 20*T) / 38 = 18.5 E = N + T + 8 ...which is 3 equations in 3 unknowns. Combining the 1st & 3rd: N + T = 38-E = E-8 So 2E = 46 E = 23 Good luck with the rest...!
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