Xiao Ming and Xiao Li collect stamps. Xiao Ming collects 1.5 times more stamps than Xiao Li. Xiao Ming collects 20 more stamps than Xiao Li. How many stamps have they collected? What's the formula

Xiaoming has 20 more than Xiaoli = 0.5 times, so 1 times = 40
Xiao Li has 40, Xiao Ming has 60

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