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ivann1987 [24]
3 years ago
13

The sum of three and a number is 24

Mathematics
2 answers:
Olin [163]3 years ago
7 0

Answer:

21

Step-by-step explanation:

let the number be 'x' then,

according to the question,

or, 3 + x = 24

or, x = 24 - 3

therefore , x = 21 ans

Whitepunk [10]3 years ago
4 0

Answer:

Step-by-step explanation:

whenever you see these questions, just subtract the first number, 3, from the total number. Doing this, 24 - 3 = 21

The number is 21

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She worked a total of 15 hours. If she makes $15 per hour tutoring and $9 per hour at the grocery store and made a total of $159
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Answer:

11 hours she worked at the grocery store

Step-by-step explanation:

assuming,

the number of hours worked at tutoring = x

the number of hours worked at grocery store = y

which means,

the amount she made at tutoring = x* $15

the amount she made at grocery store = y*$9

we have 2 equations

<em>total number of hours</em>

1) x+y= 15  

<em>total amount she earned</em>

2) x* $15+ y* $9= $159

From equation 1

x+y= 15  

x=15-y

<em>we replace this x value in equation 2</em>

x* $15+ y* $9= $159

(15-y)* $15+ y* $9= $159

(15*15)- 15y+9y=159

225-6y=159

225-159=6y

66=6y

66/6=y

<u>11=y</u>  <em>the number of hours she worked at grocery store. </em>

<em>we place y=11 in our derived x equation</em>

x=15-y

x=15-11

<u><em>x=4 </em></u><em>the number of hours she worked at tutoring. </em>

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