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3 years ago

Solve the equation: 39=3m-12

Mathematics

2 answers:

sladkih [1.3K]3 years ago

7 0

Answer:

m = 17

Step-by-step explanation:

add 12 on both sides then divided by sides by 3

mote1985 [20]3 years ago

3 0

Answer:

Step-by-step explanation:

M=17

Hope this helps mark me as brainiest

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Which branch of maths includes the most of other branches symbols/functions ect.

max2010maxim [7]

Answer:

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Step-by-step explanation:

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2 years ago

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Answer:

Step-by-step explanation:

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3 years ago

Last year , there were 30 male members and 20 female members in a Chess Club . This year , the number of male members is decreas

LekaFEV [45]

The r% of a quantity x is computed by dividing x in 100 parts, and considering r of such parts. So, the r% of the male is

$30\times\cfrac{r}{100} = 0.3 r$

and similarly, the r% of female is

$20\times\cfrac{r}{100} = 0.2 r$

The number of males decreased by this quantity, so now it is

$30 - 0.3r$

and the number of female increased by this quantity, so now it is

$20+0.2r$

we know that these two new counts are the same number, so we can build and solve the equality

$30 - 0.3r = 20+0.2r$

Subtract 20 and add 0.3r from both sides:

$10 = 0.5r$

Divide both sides by 0.5 to solve for r:

$r = 20$

Let's check the answer

The 20% of 30 is $30 \times \frac{20}{100} = 6$ , while the 20% of 20 is 4. So, we are stating that $30-6 = 20+4$ which is true because both expressions evaluate to 24.