Respuesta :
Answer:
40
Step-by-step explanation:
Girls=(25+b)
boys=b
girls + boys=105
(25+b)+b=105
2b=80
b=40
Check answer
girls=b+25
girls=40+25
girls=65
boys+girls=105
40+65=105
105=105
There are 40 boys in the school.
What is an equation?
"It is a mathematical statement which consists of equal symbol between two algebraic expressions."
For given question,
Let 'x' be the number of girls and 'y' be the number of boys in the school.
There are 105 pupils in a school.
So, we get an equation,
⇒ x + y = 105 ..................(1)
the girls are 25 more than the boys.
So, we get an equation,
⇒ x = y + 25 .........................(2)
Substitute above value of x in equation (1)
⇒ (y + 25) + y = 105
⇒ 2y + 25 = 105
⇒ 2y = 80
⇒ y = 40
Substitute above value of y in equation (2),
⇒ x = 40 + 25
⇒ x = 65
Therefore, there are 40 boys in the school.
Learn more about an equation here:
https://brainly.com/question/649785
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