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3 years ago

Try it .............

Mathematics

2 answers:

Veseljchak [2.6K]3 years ago

7 0

Step 1: 3

Step 2: 6

Step 3: 16

Step 4: 8

Step 5: 5

Nice

Marat540 [252]3 years ago

7 0

This is always true, and can be understood why through some algebra.

Let “x” represent your initial number.

STEP 1: Think of any number

STEP 2: Double it

STEP 3: Add 10

2x + 10

STEP 4: Halve it

(2x + 10)/2

which equals

x + 5

STEP 5: Take away the number you originally though [sic] of in Step 1

x + 5 - x

which simplifies into

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Answer:

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Step-by-step explanation:

Given:

Number of hours required to complete a job by welder = 18 hours

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Solution:

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Time required on job is equal to sum of Number of hours welder work on job and Number of hours required by apprentice to complete the job.

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Now we can say that;

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$\frac{6}{18}+\frac{20}{a}=1$

By reducing the fraction we get;

$\frac{1}{3}+\frac{20}{a}=1$

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Now denominators are same so we will solve the numerator we get;

$\frac{a+60}{3a}=1$

Multiplying both side by 3a we get;

$\frac{a+60}{3a}\times3a=1\times 3a\\\\a+60=3a$

Combining the like terms we get;

$3a-a=60\\\\2a=60$

Dividing both side by 2 we get;

$\frac{2a}{2}=\frac{60}{2}\\\\a=30\ hrs$

Hence the apprentice can complete the job in 30 hours by working alone.

4 0

3 years ago