In the sixth grade, the first volume of mathematics learning and consolidation, Haiyan Publishing House 3 1 page, set equations to solve the score problem.
1. Calculate (1) x+ 1/2 x=90 solution: x = 60 90-60 = 30 (2) x+1/2x = 480 solution: x =320 2. (! ) 27- four fifths =15 (2)16 \ (1+one third) = 12 12 times five sixths equals 10.