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the better Reiny
Answers (1)
by Reiny's formation of equations, eqn.1. should look like n + d + 2(n + d)=90 3n + 3d=90 3(n + d)=90 n + d=30 n=30 - d eqn.2. 5n + 10d + 2(n + d)=285 7n + 12d=285 7(30 - d) + 12 d=285 5d= 70 [d=15] then lets find out n: n=30-15 [n=15] lets check if it all
