The green team planted 500 trees, and the survival rate of these trees was 96%. How many trees survived?

500 × 96% = 480 (trees)

The students of the green team went to the barren mountain to plant trees. The survival rate of the trees was 95%, but 20 did not survive. How many trees did the students plant?

Let's go to the barren mountain and plant x trees
Tree mortality = 1-tree survival rate = 1-95% = 5%
x×5%=20
x=20÷5%=400
A: students have planted 400 trees

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