Answer:
20w(p + r)
Explanation:
We can factorize it in the following way...
5wp + 15wp + 20wr = 20wp + 20wr = 20w(p + r)
It's readily evident that 5w is common to all three terms. Factoring out 5w, we get:
5w(p + 3p + 4r), or
5w(4p + 4r), or
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