Dad works for 5 days and has a rest for 1 day, mom works for 3 days and has a rest for 1 day. On the 1st, mom and dad rest at home at the same time. On the 3rd, they rest at the same time? (it's better to have a formula

Dad works for 5 days and has a rest for 1 day, mom works for 3 days and has a rest for 1 day. On the 1st, mom and dad rest at home at the same time. On the 3rd, they rest at the same time? (it's better to have a formula


18 6 * 6 = 31 1 * 0 = 30



Xiaohong, Xiaoli and Xiaoyu spent 23.75 yuan to the supermarket, 11.28 yuan to Xiaoli and Xiaoyu, and 13.15 yuan to Xiaohong and Xiaoyu. How much did Xiaohong, Xiaoli and Xiaoyu spend?
Please write the formula


11.28+13.15-23.75

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