11.2. Doctor Vaccinov and Doctor Injectionov vaccinated all the residents of the village of Covido. Vaccinov thought: if I had given 40% more vaccinations, then Injectionov's share would have decreased by 60%. And how would Injectionov's share change if Vaccinov had given 50% more vaccinations? (7 points)

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# Solution

$40 \%$ of the injections given by Privevkin equals $60 \%$ of the number of injections given by Ukolkin, so Privevkin gave 1.5 times more injections. Therefore, an increase in Privevkin's share by $n \%$ would decrease Ukolkin's share by $1.5 n \%$.

Answer: It would decrease by $75 \%$.

| criteria | points |
| :--- | :---: |
| 1. correct solution | 7 |
| 2. Found that Privevkin gave 1.5 times more injections | 3 |
| 3. unjustified correct answer | 0 |