Compassionate
  • Compassionate
What is happening here [ http://prntscr.com/8jajiq ]
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
Maths happening yo
Compassionate
  • Compassionate
Wouldn't it be \[120x - 3600 \space \space NOT \space \space 120x - 120 \times 30\]
Compassionate
  • Compassionate
Logic being: -120 * 30 - 3,600

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kropot72
  • kropot72
@Compassionate If you calculate the value of -120 * 30 when it arises, the final result of the calculation of the value of x does not change.
Compassionate
  • Compassionate
Come again? Put that in idiot terms for me.
kropot72
  • kropot72
120x - 3600 = 80x 40x = 3600 x = 90
kropot72
  • kropot72
@Compassionate Are you there?
Compassionate
  • Compassionate
\[120x - 3,600 = 80x \space \space \space, \space \space \space 40x = 3,600 \space \space \space , \space \space \space x = 90\]
Compassionate
  • Compassionate
Oh, I get it. So, we can solve it by multiplying out regularly, just the tutorial I am doing does it weird and shows the processes. That's what confused me. And since we know x - 30, we just say 90 - 30.
Compassionate
  • Compassionate
Can we do one more?
kropot72
  • kropot72
Sure. Go ahead.
Compassionate
  • Compassionate
Train A has a speed 15 mi/hr greater than train B. If train A travels 150 miles in the same time train B travels 120 miles, what are the speeds of the two trains? Here is my logic. Train A = x + 15. \[\frac{ 150 }{ x +15} = \frac{120}{x}\]
Compassionate
  • Compassionate
150x = 120x + 1,800 30x = 1,800 x = 60 Recalling x + 15 for A's speed, 60 + 15 = 75
kropot72
  • kropot72
All good.
Compassionate
  • Compassionate
Thanks a lot, man. I don't usually fan people, I only have a handful, maybe 9 -10, but I'll shoot you a fan because you're quite helpful.
kropot72
  • kropot72
Thank you and you're welcome :)

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