First of all, we need to accept such a pure mathematical concept: the cooperation between company A and company B is completed within six weeks, which can be regarded as six weeks for company A and six weeks for company B to complete the decoration. On the contrary, Company A will do it alone for 4 weeks, and the remaining Company B will finish it in 9 weeks. It can also be regarded as cooperation for 4 days, and company B will complete the renovation in 5 days.
(1) From the point of view of saving time, Company A should be chosen. Company B's 9 weeks can be divided into two parts, one is 6 weeks and the other is 3 weeks. After six weeks of cooperation, it should be that Company A completed all the work in six weeks and Company B completed all the work in six weeks. In contrast, it took Company A three weeks to complete the remaining two weeks, so Company A was quick.
(2) From the perspective of saving money, Company B should be chosen. It takes three weeks for a company to work for two weeks, which can be converted. It takes 65,438+05 weeks for A to complete alone, and 65,438+05 weeks for B to complete alone. It can be considered that A is 5 2 weeks and B is 5 3 weeks ... Comparing 48,000 and 52,000, it is found that Company B spends less in three weeks than Company B does in two weeks. So b costs less.
QQ: 28893484, a professional math teacher.