solve this it attached
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[tex]\\ \sf\longmapsto \dfrac{15}{k}[/tex]
Put the value
[tex]\\ \sf\longmapsto \dfrac{15}{3}[/tex]
[tex]\\ \sf\longmapsto 5[/tex]
[tex]\large\bf{\orange{ \implies}} \tt \: \frac{15}{k} \\ [/tex]
Value of k is 3
[tex]\large\bf{\purple{ \implies}} \tt \: \cancel\frac{15}{3} \: = \: 5 \: \\ [/tex]