(1) 1 6 :0.8=χ:48, 0.8x=48× 1 6 , 0.8x÷0.8=8÷0.8, x=10, (2) 2 3 χ+ 1 2 χ=42, 7 6 x=42, 7 6 x× 6 7 =42× 6 7 , x=36.