Hi I need help on fraction expressions,

Question

anonymous · Answer

$$m/2+ m/3=10$$

jim_thompson5910 · Answer

If you multiply EVERY term by the LCD 6, you'll get the equation 


3m + 2m = 60


Now you can solve for m:


5m = 60


m = 60/5


m = 12

anonymous · Answer

so how do you know what the lcd is if it the questions is like 3xover4+5xover2=13

jim_thompson5910 · Answer

The LCD here is 4 since the LCM of 4 and 2 (both denominators) is 4.

anonymous · Answer

then u divide by four

jim_thompson5910 · Answer

then you multiply EVERY term by the LCD 4 to clear out the fractions.

anonymous · Answer

oh ok so 4(3)x + 4(5x)=4(13)

anonymous · Answer

13/8

jim_thompson5910 · Answer

close...it's more like 4(3x/4) + 4(5x/2)= 4(13) which becomes the much simpler equation:

3x + 10x = 52

jim_thompson5910 · Answer

now solve to get 


3x + 10x = 52


13x = 52


x = 52/13


x = 4

anonymous · Answer

how did you get 10x?

anonymous · Answer

oh nevemind thank

jim_thompson5910 · Answer

4(5x/2) = 20x/2 = 10x

anonymous · Answer

thank you! i still hate math!

jim_thompson5910 · Answer

lol np, that's ok, just keep at it and you'll get it

anonymous · Answer

sure lol maybe or maybe not its the damn fractions thats kill me

jim_thompson5910 · Answer

well once you've cleared them by using that trick, things aren't so bad...just have to remember how to clear them

anonymous · Answer

i try to keep that in mind.

jim_thompson5910 · Answer

also, keep in mind this trick only works with equations