Respuesta :

this is the answer
[tex] \frac{21}{1} \div \frac{3}{4} = \frac{21}{1} \times \frac{4}{3} \\ = \frac{84}{3} = 28[/tex]
or you can solve it like this
[tex]21 \div \frac{3}{4} = 21 \div 0.75 = 28[/tex]
hope this helps