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3 years ago

Sandra can type 180 words in 3 minutes. At this rate, how many words can she type in 5 minutes?

Mathematics

2 answers:

Gnom [1K]3 years ago

7 0

180/3 = 60 she can write 60 words per minute. 60 x 5 = 300 She can type 300 in five minutes.

mezya [45]3 years ago

5 0

180 divided by 3 = 60

60 x 5 = 300

she can type 300 words in 5 minutes

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If you add Natalie's age and Fred's age, the result is 36. If you add Fred's age to 4 times Natalie's age, the result is 72.

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The known facts

the sum of Natalie's age and Fred's age is 36
the sum of Fred's age times four and Natalie's age is 72

Now, let's set up the equations where N is Natalie's age and F is Fred's age.

N + F = 36 ---- equation 1

N + 4F = 72 ---- equation 2

equation 2 minus equation 1 ---> 3F = 36 ---> F = 12, thus N = 24

Thus Fred is 12 years old, and Natalie is 24 years old.

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Step-by-step explanation:

Given : Significance level : $\alpha: 1-0.90=0.10$

Critical value : $z_{\alpha/2}=1.645$

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