Answer:
[tex]Boys = 81[/tex]
Step-by-step explanation:
Given
[tex]Boys : Girls = 9 : 8[/tex]
[tex]Girls = 72[/tex]
Required
Find the number of boys
Substitute 72 for girls in [tex]Boys : Girls = 9 : 8[/tex]
[tex]Boys : 72 = 9 : 8[/tex]
Convert ratio to fraction
[tex]\frac{Boys}{72} = \frac{9}{8}[/tex]
Multiply both sides by 72
[tex]72 * \frac{Boys}{72} = \frac{9}{8} * 72[/tex]
[tex]Boys = \frac{9}{8} * 72[/tex]
[tex]Boys = 9*9[/tex]
[tex]Boys = 81[/tex]
