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GREYUIT [131]
3 years ago
12

Alima is solving a question, where a given number has to be multiplied by 15. Alima did not read the question carefully, and mul

tiplied the number by 5 (instead of 15). If her answer is 150 less than the correct answer, find the given number.
Mathematics
1 answer:
loris [4]3 years ago
3 0

x    -  Alma's given number

15•x  -  the number multiplied by 15 (the correct answer)

5•x   - the number multiplied by Alma (Alma's answer)

her answer is 150 less than the correct answer:

5•x = 15•x - 150

15x - 150 = 5x

15x - 5x = 150

 10x = 150

   <u>x = 15</u>

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Answer:

Step 1 of 2:
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Step 2 of 2:
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Step-by-step explanation:

1. Putting word statement in algebraic form

Step 1:
Let x be the unknown number ==> x is the unknown variable to be used in the equation and to be solved for

Step 2:
-26 times a number minus 5 ==> -26x - 5

Step 3:
is equal to 56 less than the number  ==> = x - 56

Putting it all together:
-26x - 5 = x - 56

2. Solving the equation
-26x - 5 = x - 56

1. Subtract x from both sides:
-26x - 5 - x = x - x  -56

-26x -x - 5 = -56

-27x - 5 = -56

2. Add 5 to both sides
-27x - 5 + 5 = -56+ 5

-27x = -51

x = -51/-27   (dividing both sides by -27)

x = 51/27    (negative divide by negative results in positive)

Reduce 51/27 by dividing numerator and denominator by 3

x = (51 ÷ 3)/(27 ÷ 3) = 17/9

= 1.88888.... = 1.89 rounded to two decimal places

7 0
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