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2)42×100%÷7=600
2)900×100%÷75=1200
3)45×100%÷15=300
● 9% son 720
720 ----- 9%
X -------100%
X = 100*720/9
X= 8000✔
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●7% son 42
42 ------- 7%
X ------- 100%
X= 42*100/7
X= 600✔
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● 75% son 900
900 ------ 75%
X -------- 100%
X= 900*100/75
X= 1200✔
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● 15% son 45
45 ------- 15%
X ---------100%
X=45*100/15
X=300✔