Posted by ben on Saturday, December 8, 2012 at 10:15pm.
19.5 $/y^2 * 1 y^2/9ft^2 = (19.5/9)$/ft^2
13 ft * 22 ft = 286 ft^2
286 ft^2 * (19.5/9) $/ft^2 = 619.67dollars
approximate in head to see if reasonable
15 * 20 = 300 ft^2
about 10 ft^2 / yard^2 (nine is about ten)
so about 30 y^2
* 20 = 600 dollars
Okay I was dividing by 3 instead of 9. Got it now, thanks.
1 yd^2(3 ft/1yd)(3 ft/1 yd) = 9 ft^2/yd^2
always multiply by things that are the same top and bottom so the units come out (you are really always multiplying by one)
for example
3600 seconds is the same as 1 hour
so
3600 s/1 hr
is the same top and bottom
and
1 hr/3600 s
is the same top and bottom
same deal with 1 ft/12 in
or 12 in / 1 ft
or 1 mi / 5280 ft
or 5280 ft/ 1 mi
( if using landlubber miles )
or 16 oz /lb or 1 lb/16 oz
etc
Just get that idea in your head and these are easy.
Maria earns d dollars and owes $850 in expenses. How much, in dollars, does she have left after paying for expenses?
d-850
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