Question

我用10元钱买了3支圆珠笔和7本练习本,剩下的钱若买1支圆珠笔就少0.14元,若买1本练习本还多0.8元.每支圆珠笔多少

Answer 1

每支圆珠笔

(10+0.14+(0.8+0.14)x7)÷(3+7+1)

=(10.14+0.94x7)÷11

=16.72÷11

=1.52(元)

每本练习本

1.52-(0.8+0.14)

=1.52-0.94

=0.58(元)