You could calculate how large something is if you only have one half measure?
See the attached pictures for the answers:
Answer:
120
Step-by-step explanation:
Let g = number of girls.
(2/3)g is 2/3 the number of girls
(2/3)g + 35 is 35 more than 2/3 the number of girls. This is the number of boys.
(2/3)g + 35 = 115
(2/3)g = 80
(3/2)(2/3)g = 80(3/2)
g = 120