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Application problems of solving equations in the sixth grade of mathematics
1. I bought four packs and sent them 1 pack, 4*3 1.8= 127.2.

2、 15000*( 1+5.49%)^5*0.95= 186 15

3. Class A accounts for 3/ 12 of the total, so the total is =60/(3/ 12)=240, class B accounts for 5/ 12= 100, and class C accounts for 4/12.