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sdas [7]
3 years ago
12

Red and grey bricks were used to build a decorative wall. The number of red bricks/number of grey bricks was 5/2 There were 140

bricks used in all. How many red bricks were used?
Mathematics
1 answer:
ehidna [41]3 years ago
5 0

5/2 = 5:2

Lets take 5:2 as 5x and 2x.

5x + 2x = 140

7x = 140

x = 140/7

x = 20

So, 5x = 5x20 = 100 red bricks

and, 2x = 2x20 = 40 grey bricks.

100 + 40 = 140 bricks

So, to build the decorative wall, 100 red bricks and 40 grey bricks were used.

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I don't quite understand the LCD and the unlike denominators properly. May someone explain it, please.
Whitepunk [10]

Hey!

----------------------------------------------------------------------

LCD stands for Lowest Common Denominator.

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Explanation:

So let's say we have the equation 1/9 * 16/27

We want to find the LCD of both fractions. To find the LCD of both fractions find a the lowest common denominator in both fractions.

In this equation the lowest common denominator is 27 because 9 can go in 27 and 27 can go into itself. Se basically 27 is the lowest possibly common denominator both fractions can get to.

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Hope This Helped! Good Luck ;)

5 0
3 years ago
A tortoise is walking in the desert. It walks at a speed of 2 meters per minute for 2.56 meters. For how many minutes does it wa
zaharov [31]

distance = rate * time

2.56 meters = 2meter/min * t

divide by 2 on each side

2.56/2 =t

1.28 minutes =t

8 0
3 years ago
- 6x + 5y - 2x + 4 =
pychu [463]

Answer:

-8x + 5y + 4

Step-by-step explanation:

- 6x + 5y - 2x + 4 Group like terms

-6x - 2x + 5y + 4

=  - 8x + 5y + 4

5 0
3 years ago
Factor completely 36x2− 121.
lesantik [10]
The expression 36x² - 121 is in the 'difference of two squares form' which is (a² - b²)

Factorising (a² - b²) gives (a+b)(a-b)

Factorising 36x² - 121 gives (6x+11)(6x-11)
6 0
3 years ago
Please help me! I need help on this question!
schepotkina [342]

Answer:

C and A

Step-by-step explanation:

expand the things in parentheses so for C

1/2(x + 16) = 1/2(x) + 1/2(16) = 1/2 x + 8

same process for A

5 0
3 years ago
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