会场里有两个座位和四个座位的长椅若干把．某年级学生（不足70人）来开会，一部分学生一人坐一把两座长椅，其余的人三人坐一把四座长椅，结果平均每个学生坐1.35个座位．问有多少学生参加开会？
直接写出计算结果．
×12=
÷
=
1﹣10%=
+
=
4×25%=
18÷
=
直接写出得数：
1﹣5%=
+
=
×
= 3÷
=
6×
=
×
=
+
=
÷
=
÷12=
﹣
=
+
=
﹣= 298+76= 4.8÷0.01=
12×（×
）= 0.25×12= 3.28×0×72%= 4.62+6.8=
3.75﹣2.8=÷=
=
=
=
=
= 99×0.25+0.25=
= 7.2÷100﹣0.72÷10=
=
=
直接写出得数．
138+17= 83﹣57= 4708﹣999= 402×5= 20×500=
320÷80= 15.7+3= 10.9+1.09= 1﹣0.09= 0.9﹣0.26=
4×3.14= 3.25×4= 6.4÷0.8= 0.48÷0.03=
+
=
+
=
×4=
×
= 24÷
=
+÷+=