Answer:
$9.75
Step-by-step explanation:
$7.50+$2.75=$10.25
$10.25+9.75=$20
10 is 1/3rd of 30
C.60
Just multiply 300 by 9 and then divide by 45.
60
let the num be 3x & 4x
3x+4x=28
7x=28
x=28/7
x=4
now, num of girls=3x=3×4=12
& num of boys=4x=4×4=16