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Vesnalui [34]
2 years ago
10

3(x-2) < 2(x+9) 1. x<12 2.x>12 3. x<24 4.x>24

Mathematics
1 answer:
Nataly_w [17]2 years ago
7 0

Answer:

3rd option x<24

Step-by-step explanation:

3×(x-2)<2×(x+9)

3 times everything in the bracket and 2 times everything in the bracket.

3x(-2x)-6<2x(-2x)+18 take away 2x from both sides

( Opposite operators EG, Add becomes subtract)

x-6(+6)<18(+6) add 6 on both sides

x<24

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Maitri and Aabhas do a work in 12 hours.
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Answer:

See below ~

Step-by-step explanation:

<u>Given</u>

  • Maitri and Aabhas do a work in 12 hours
  • Aabhas and Kavya do the work in 15 hours
  • Kavya and Maitri do the work in 20 hours

<u>Solving</u>

  • Take Maitri, Aabhas, and Kavya to be x, y, z respectively
  • <u>x + y = 12</u> (1)
  • <u>y + z = 15</u> (2)
  • <u>x + z = 20</u> (3)

<u>Take Equation 1 and rewrite it so that it is equal to x.</u>

  • x = 12 - y

<u>Take Equation 2 and rewrite it so that it is equal to z.</u>

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<u>Now, substitute these values in Equation 3.</u>

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  • 12 - y + 15 - y = 20
  • -2y + 27 = 20
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<u></u>

<u>Substitute the value of y in Equation 1.</u>

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<u>Substitute the value of y in Equation 2.</u>

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  • z = <u>11.5 hours [Kavya]</u>

<u></u>

<u>Add the values of x, y, and z together.</u>

  • x + y + z
  • 8.5 + 3.5 + 11.5
  • 12 + 11.5
  • <u>23.5 hours [together]</u>

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