390 pluse something equl 450 = 840
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Oh, dude, 390 plus something equals 450? That "something" is 60. So, like, if you add 390 and 60 together, you get 450. It's like basic math, but hey, I'm here to make it sound cooler.
It is 390 minutes.
Yes. You can do something like: 450 - 10 - 245 - 38
80 percent of 450 = 36080% of 450= 80% * 450= 0.80* 450= 360
40% of 450 = 18040% of 450= 40% * 450= 0.40 * 450= 180
12.5% of 450= 12.5% * 450= 0.125 * 450= 56.25