The reason for cross multiplying is so you can get all the other variables in terms of b You want everything else in terms of b so that when you plug it into the equation the variable b will cancel out and you get the answer
If this answer came to me I would kill the teacher who make the exam paper It’s such a confusing answer that it mentally forces us to redo the sum to see if the answer is correct.
@@roshandhumal119315*4 because when dividing 2 fractions, we reciprocate the divisor and then multiply it by the dividend. • 15b / (17b/4) • (15/1) / (17/4) • (15/1) * (4/17) • 60/17 ✓ As for the 4 in the divisor, it came from the simplification of 3*(b/12) • 3*(b/12) [we multiply by numerator by numerator denom and denom.] • 3b/12 [simplify] • (3b÷3) / (12÷3) • b/4 ✓✓
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I thrived in maths like this a while ago... Now I enjoy the nostalgia and the mental gymnastics through these videos.
Just combine a:b and b:c into a:b:c which in this case is 72:12:1. Now put these values in equation n do the math. Easy 😊
I love your chalk's sound. It helps me to fix maths in my mind.
I love your teaching skills.
just assume b=1 get value of a & c then put in the equation. It always works and is the shortest method to solve any algebraic equation like this.
I like your simple approach. What makes you think about cross multiplication?
I think it's a very good method. It should be used whenever possible.
@HEC Tutoring
I thought it could be used only to simplify. I don't get it how to use it in other situations (like the one in the video)
The reason for cross multiplying is so you can get all the other variables in terms of b
You want everything else in terms of b so that when you plug it into the equation the variable b will cancel out and you get the answer
Another great video.
Ok.
C'est relativement simple pour ce matin.
Where can i get a black board like this?
I got it on Amazon
But it makes annoying sound!
A=12*6
B=12*1
C=1 * 1
144+18/24+3= 6/3=
12/6*1-¹²*1=2
How did you get 60 over 17?
Wow 🎉🎉🎉🎉
and that's how children don't understand
🥵🥵
If this answer came to me
I would kill the teacher who make the exam paper
It’s such a confusing answer that it mentally forces us to redo the sum to see if the answer is correct.
This problem on the actual ACT exam couple years back.
How did you get 17b?
Denominator: 4b+3(b/12)
=4b+(3b/12) [simplify the fraction]
=4b+(b/4) [add: multiply the 4 by 4b then add the answer to 1b]
=17b
@@hotcat6687ok nice explanation but why 15 * 4 and where 4 comes from 😅
@@roshandhumal119315*4 because when dividing 2 fractions, we reciprocate the divisor and then multiply it by the dividend.
• 15b / (17b/4)
• (15/1) / (17/4)
• (15/1) * (4/17)
• 60/17 ✓
As for the 4 in the divisor, it came from the simplification of 3*(b/12)
• 3*(b/12) [we multiply by numerator by numerator denom and denom.]
• 3b/12 [simplify]
• (3b÷3) / (12÷3)
• b/4 ✓✓
@@hotcat6687 thank you so much for clearing my confusion☺️
I calculated it mentally in less than 15 seconds.
Good job! 👍
@@mrhtutoring Bro not mad
Good job buddy boy. Here's a star sticker.
Where are you
слишком простое, надо что-то посложнее
72:12:1