shyannmcmahon9991 shyannmcmahon9991

21-10-2017
Mathematics

contestada

In a class of 42 students, the number of boys is 2/5 of the girls. How many boys and girls are there?

Respuesta :

texaschic101 texaschic101

21-10-2017

b + g = 42
b = 2/5g

2/5g + g = 42
2/5g + 5/5g = 42
7/5g = 42
g = 42 / (7/5)
g = 42 * 5/7
g = 210/7
g = 30 <== there are 30 girls

b = 2/5g
b = 2/5(30)
b = 60/5
b = 12 <=== there are 12 boys

Answer Link

Otras preguntas

Recall the definition of an acid that you learned in chemistry. Explain how the reaction below illustrates the acidic properties of lactic acid.

Can someone please help

what is the actual lifespan of white blood cells?

Democritus and dalton both proposed the concept of atoms. describe the method each of them used to reach the conclusion that atoms existed. how did democritus's

Which of the following statements is false? Multinational companies account for more than $3 trillion of worldwide assets. Multinational companies are sometimes

her lips were blue her nose was red and a little icicle on her eyelashes what literary literary device does the author use

What do sociologists refer to as "public policy"?

How are religion and culture connected? no need for a long answer!

__________ indicates a BAL of .08 or higher. A. Compulsive behavior B. Weakened vision C. Reduced control of vehicle speed D. Loss of judgment

Ancient philosophers classifed water as an element. Why do modern scientists not classify water as an element?