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3 years ago

Sushi was thinking of a number. Sushi doubles it,then adds 20 to get an answer of 27.7 what was the original number

Mathematics

2 answers:

koban [17]3 years ago

4 0

Answer:

3.85

Step-by-step explanation

7.7 divided by 2 = 3.85

So if you double 3.85 you get 7.7 and then add 20 to 7.7 then you get 27.7

erastova [34]3 years ago

3 0

Let the number they are thinking of be X.

They double x , which would be 2x.

They then add 20, which would be 2x +20

So you have 2x + 20 = 27.7

Now we can solve for x:

Subtract 20 from both sides:

2x = 7.7

Divide both sides by 2:

x = 7.7 / 2

x = 3.85

The original number was 3.85

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3 years ago

Solve the equation: \frac{2}{3}t=\frac{5}{9} (hint: reciprocal)

Aleks04 [339]

Given:

$\frac{2}{3}t=\frac{5}{9}$ $\text{ We know that the reciprocal of }\frac{2}{3}\text{ is }\frac{3}{2}\text{.}$

Multiply both sides by 3/2, we get

$\frac{3}{2}\times\frac{2}{3}t=\frac{3}{2}\times\frac{5}{9}$

Cancel out the common multiples, we get

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1 year ago

Find the area of the shaded region. Express your answer in terms of π.

Bogdan [553]

Answer:

335.115

Step-by-step explanation:

First you find the area of the circles to do that you do pi times radius squared

For the top square do 3.14(pi)time 3²=28.26

For the middle square do 3.14 times 4.5²=63.585

For the bottom square do 3.14 times 6²=113.04

Now find the area of the entire thing do 18×12+9+6+3=18×30=540

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So the shaded region is 335.115

Hope this helps and have a great day!

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