Question

gente me ajudam exercicio da foto

Answer 1

adulto =x

cça = y

[x+y=125   x=125-y

[x(20)+y(12)=2140

125-y(20)+y(12)=2140

2500-20y+12y=2140

-20y+12y=2140-2500

-8y=-360

y= 45

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perímetro = soma dos lados

retângulo     28= 2x+2y

triangulo     32=   2x+3y

calculando   (28= 2x+2y)/2  ------>  14=x+y                  ------>       14-x=y

substituindo o y  na expressão do triangulo      32=2x+3(14-x)

                                                                          32=2x+42-3x

                                                                         32-42=2x-3x

                                                                            x=10

calculando o y               14=10+y

                                      14-10=y

                                       y=4