Ill give a medal if someone can help set up this equation? :)

Question

anonymous · Answer

David can unload a delivery truck in 20 minutes. Allie can unload the same delivery truck in 35 minutes. If they work together, how long will the unloading take?

paki · Answer

1/20+1/35=1/x.... solve for "x"...

paki · Answer

and at the end, invert the "x", as here the "x" is in reciprocal form....

anonymous · Answer

Can you help me solve it? I dont understand equations with fractions it just hurts my head

paki · Answer

ahh... just take the LCM of the left side... that's all...

anonymous · Answer

LCM ?

anonymous · Answer

How do i do that?

paki · Answer

ok...see here the LCM will be 140.... now

7+4/140=1/x
11/140=1/x
or x=140/11
or x= 12.72 = 13 minutes.... hope it will be clear now... @AmberLynn127

anonymous · Answer

Thank you!

paki · Answer

pleasure

anonymous · Answer

A yogurt shop offers 7 different frozen yogurt flavors and 10 different toppings. How many different combinations can be made using one flavor and one topping?