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salinasroel22
15.07.2019 •
Mathematics
Ahmed is riding the elevator in a building. the building has floors above and below ground level. ahmed uses the expression below to describe his movement. 6 + (–8) which statement could describe ahmed’s movement? a.ahmed started 6 floors above ground level, then he went down 8 floors. b.ahmed started 6 floors above ground level, then he went up 8 floors. c.ahmed started 6 floors below ground level, then he went up 8 floors. d.ahmed started 6 floors below ground level, then he went down 8 floors.
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Ответ:
The answer is A
Step-by-step explanation:
Ответ:
Ответ:
Example 1:
In a bag of red and green sweets, the ratio of red sweets to green sweets is 3:4. If the bag contains 120 green sweets, how many red sweets are there?
Solution:
Step 1: Assign variables :
Let x = red sweets
Write the items in the ratio as a fraction.
red/green
Step 2: Solve the equation
Cross Multiply
3 × 120 = 4 × x
360 = 4x
Isolate variable x
x=360/4
There are 90 red sweets.
Example 2:
John has 30 marbles, 18 of which are red and 12 of which are blue. Jane has 20 marbles, all of them either red or blue. If the ratio of the red marbles to the blue marbles is the same for both John and Jane, then John has how many more blue marbles than Jane?
Solution:
Step 1: Sentence: Jane has 20 marbles, all of them either red or blue.
Assign variables:
Let x = blue marbles for Jane
20 – x = red marbles for Jane
We get the ratio from John
John has 30 marbles, 18 of which are red and 12 of which are blue.
red/blue
We use the same ratio for Jane.
red/blue
Step 2: Solve the equation
Cross Multiply
3 × x = 2 × (20 – x)
3x = 40 – 2x
Isolate variable x
x=40/5
John has 12 blue marbles. So, he has 12 – 8 = 4 more blue marbles than Jane.
John has 4 more blue marbles than Jane.
Step-by-step explanation: