Numa caixa estão berlindes vermelhos, amarelos e azuis: 20%dos berlindes são vermelhos,40% são amarelos e o número de berlindes azuis é 80. Quantos berlindes há na caixa

200 berlindes

Step-by-step explanation:

Vamos representar

O número total de berlindes na caixa = X

Mármores vermelhos = 20% de X

= 0.2X

Mármores amarelos = 40% de X

= 0.4X

Mármores azuis = 80

Conseqüentemente,

0.2X + 0.4X + 80 = X

Recolher termos semelhantes

80 = X - 0.2X - 0.4X

80 = X - 0.6X

80 = 0.4X

Divida ambos os lados por 0.4

X = 80 / 0.4

X = 200

Uma vez que X representa o número total de berlindes na caixa, portanto, o número total de berlindes na caixa = 200 berlindes

the inequality is:

250c+180g≥950

step-by-step explanation:

let c denotes the number of days in a week   miyoko worked as a cryptographer.

and g denotes the number of days in a week she works as a geologist.

now we are given that she earns $250 for every day she works as a cryptographer,and earns $180 for every day she works as a geologist.

now miyoko's goal is to earn more than $950 this week.

hence, the inequality could be represented as:

250c+180g≥950

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)