Sushil was thinking of a number. Sushil adds 7 to it, then doubles it and gets an answer of 85.5. What was the original number?

Mathematics

2 answers:

ELEN [110]3 years ago

7 0

Answer:

35.75

Step-by-step explanation:

x+7

Now we double it or multiply it by 2.

2(x+7)

And this is supposed to be equal to 85.5

2(x+7) = 85.5

x+7 = 42.75

x = 35.75

LiRa [457]3 years ago

5 0

Answer:

39.25

Step-by-step explanation:

You might be interested in

The line width used for semiconductor manufacturing is assumed to be normally distributed with a mean of 0.5 micrometer and a st

Alinara [238K]

Answer:

There is a 0.82% probability that a line width is greater than 0.62 micrometer.

Step-by-step explanation:

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by

$Z = \frac{X - \mu}{\sigma}$

After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X. The sum of the probabilities is decimal 1. So 1-pvalue is the probability that the value of the measure is larger than X.

In this problem

The line width used for semiconductor manufacturing is assumed to be normally distributed with a mean of 0.5 micrometer and a standard deviation of 0.05 micrometer, so $\mu = 0.5, \sigma = 0.05$ .