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25-07-2021
Mathematics

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10 times a certain number plus 5 times the same number equals 90 what is the number

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25-07-2021

Let the number be x

ATQ

[tex]\\ \sf\longmapsto 10x+5x=90[/tex]

[tex]\\ \sf\longmapsto (10+5)x=90[/tex]

[tex]\\ \sf\longmapsto 15x=90[/tex]

[tex]\\ \sf\longmapsto x=\dfrac{90}{15}[/tex]

[tex]\\ \sf\longmapsto x=6[/tex]

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