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Question Number 161282 by byaw last updated on 15/Dec/21

Answered by alephzero last updated on 16/Dec/21

$$\mathit{F}\mathit{i}\mathit{r}\mathit{s}\mathit{t}\mathit{m}\mathit{e}\mathit{t}\mathit{h}\mathit{o}\mathit{d}.$$$$\frac{u}{2}\to u\to 3.14u$$$$\left(1\right)3\to 6\to 3.14u=?$$$$u=6\Rightarrow 3.14\left(6\right)=18.84$$$$\left(2\right)\frac{u}{2}\to 10\to 50.24$$$$u=10\Rightarrow \frac{u}{2}=\frac{10}{2}=5$$$$Answer:x=18.84,y=5$$$$\mathit{S}\mathit{e}\mathit{c}\mathit{o}\mathit{n}\mathit{d}\mathit{m}\mathit{e}\mathit{t}\mathit{h}\mathit{o}\mathit{d}.$$$$k\to 2k\to 3.14\times 2k$$$$3.14\times 2=6.28$$$$\Rightarrow k\to 2k\to 6.28k$$$$\left(1\right)3\to 6\to 6.28k$$$$k=3\Rightarrow 6.28k=6.28\times 3=18.84$$$$\left(2\right)k\to 10\to 50.24$$$$2k=10\Rightarrow k=\frac{10}{2}=5$$$$Answer:x=18.84,y=5$$

Commented by MJS_new last updated on 16/Dec/21

$$\mathrm{but}\mathrm{in}\mathrm{the}\mathrm{last}\mathrm{line}\frac{u}{2}\to u\to 3.14u{\mathrm{doesn}}^{\prime }\mathrm{t}$$$$\mathrm{work}\mathrm{because}3.14\times 5\ne 50.24$$

Commented by alephzero last updated on 16/Dec/21

$$Hm...{You}^{\prime }reright!$$

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