Question 1086291
d+n = 60 subtract n from both sides:
d = 60-n I'll use this value for d next.
0.10d+0.05n = 4.80 substitute for d:
0.10(60-n)+0.05n = 4.80 distribute the 0.10 over the terms in parenthesis (Distributive Properties of Multiplication)
6-0.10n+0.05n = 4.80 subtract 6 from both sides and resolve n on left:
-0.05n = -1.2 divide both sides by 0.05, and remember -/- = + Use your calculator.