so, something fused, and that amount was 20% of the whole thing.
1420 grams did not fuse, and since a whole is 100%, 100% - 20% = 80%, so that has to be the remaining 80%.
since we know that 1420 is 80%, what is 20%?
Solve it like a normal equation, but with < instead of =
9k - 2 < 3k + 10
-3k -3k
_____________
6k - 2 < 10
+2 < +2
_____________
6k < 12
÷6 ÷6
_____________
k < 2 is your final answer :)
Distance = d in miles
speed = s in miles per hour
time = t in hour
s = d/t
s*t = d
d = 65 * 3.5
d = 227.5
Answer: The district traveled by a car going 65 mph for 3.5 hours is 227.5 miles.