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FrozenT [24]
3 years ago
6

Write an equation for the following situation: 15 less than a number is equal to 12

Mathematics
1 answer:
weeeeeb [17]3 years ago
3 0
Break it down
"15 less than " means -15
"a number" means unknown or placeholder means x
"is equal to" means '='
'12' means 12
-15+x=12
add 15
x=27
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Vlad [161]
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iris [78.8K]
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4 0
3 years ago
The mean of five numbers is 8. when another number is added the mean is 7. find the number added
sasho [114]

Answer:

\large \boxed{\sf \ \ 2  \ \ }

Step-by-step explanation:

Hello,

<u>The mean of five numbers is 8</u> so we can write

\dfrac{x_1+x_2+x_3+x_4+x_5}{5}=8

<u>When another number is added the mean is 7</u>, let s note x the another number we can write

\dfrac{x_1+x_2+x_3+x_4+x_5+x}{6}=7

From the first equation we can say

x_1+x_2+x_3+x_4+x_5=8*5=40

So the second equation becomes

\dfrac{x_1+x_2+x_3+x_4+x_5+x}{6}=7\\\\ \dfrac{40+x}{6}=7\\\\40 + x = 6*7=42\\\\ x = 42-40 = 2\\

The solution is then 2

Hope this helps

4 0
3 years ago
35% of a number is what fraction of that number​
OLEGan [10]

Answer: 7/20

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
A clothing store sells a customer 3 T-shirts and 4 pairs of shorts for $83.
ss7ja [257]
3t + 4s = $83
4t + 1s = $50 (x 4)

16t + 4s = $200
3t + 4s = $83 (minus them£

13t = $117 (divide by 13)

t = $9

sub t into first equation.

3 x 9 = 27
27 + 4s = $83
4s = $56
s = $14

t = $9
s = $14
7 0
3 years ago
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