Answer :

naǫ
x - the number

[tex]30\% x =42 \\ \frac{30}{100}x=42 \\ \frac{3}{10}x=42 \\ x=42 \times \frac{10}{3} \\ x=\frac{420}{3} \\ x=140[/tex]

42 is 30% of 140.

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