Answer:
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
Answer:
Circle man ez
Step-by-step explanation:
Answer:
49000
Step-by-step explanation:
since it is the same worth
Answer:
Correct answer is (e) all of the above.
step-by-step explanation:
As for the option (a) and (d), you can't give information you don't have. When you are not aware of the diseases, you can not give information about it.
For option (b), when the interviewer did not record the information or record it incorrect, it can not be used for survey.
For option (c), when correct questions are not asked, you can't required answers for the survey.
Summation of the above will be sources of error for the survey.