James and John share 9000 in the ratio 3 :2 How much does John receive

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An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .

Could someone me with this question i’ve been stuck on it for 20 minutes

Y=21.95x+10 y=22.45x solve by substitution