1) The Chan family was charged $24 for surfing the internet for 600 minutes last month.At this rate,how much would the Chan family be charged for surfing the Internet for 450 minutes this month?
2) Caili is reading an interesting book.She reads 560 pages in 10 days.At this rate,how many days will she take to read 392 pages?
Pls.tell me what's the formula.It's because It's just I cannot think right now.....THANKS!!!!
2006-08-27 23:22:33 · 14 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
600min = $24 (divide by 600 to get one minute).
1min = $24/600
1min = $0∙04 (multiply by 450 to get 450minutes).
450min = $18∙00
(b)
560p = 10days (divide by 560 to get one page).
1p = 10/560
1p = 0∙017857142 (now multiply by 392)
392p = 7days.
2006-08-27 23:25:35 · answer #1 · answered by Brenmore 5 · 0⤊ 0⤋
1. min $
600 - 24
450 - ?
=(450/600)X 24
= $18
2. Pages days
560 - 10
392 - ?
= (392/560)*10
= 7days
2006-08-28 06:30:31 · answer #2 · answered by Anonymous · 0⤊ 0⤋
1) answer is $18 600/4*6=24
2) answer is 7 days 500/10=50 50/10=5 10/10=1 50+5+1=56 392/56=10
2006-08-28 06:31:20 · answer #3 · answered by .................. 4 · 0⤊ 0⤋
F=the first number
S=the second number
T=the third number
A=the answer
so, Fdivided by S x T = A
1)$24 divided by 600 minutes timesed by 450 minutes = ???
2)560 pages divided by pages divided by 10 days timesed by 392 pages = ??? pages
hehe i really luv maths LOL
2006-08-28 06:33:22 · answer #4 · answered by Gabby [xXx] 2 · 0⤊ 0⤋
24 / 600 = 0.04 per minute
0.04 x 450 mins = $18
560 / 10=56 so 56 pages a day
392 pages / 56 pages a day = 7 days
hope it helps!
2006-08-28 06:31:16 · answer #5 · answered by J4xxs 2 · 0⤊ 0⤋
1)24*450/600=18
2)10*392/560=7
2006-08-28 06:29:13 · answer #6 · answered by Anonymous · 0⤊ 0⤋
1. Charge = ($24/600) * 450
2. 560/10 = 392/x
560 x = 3920
x=7 days
2006-08-28 06:29:51 · answer #7 · answered by z_o_r_r_o 6 · 0⤊ 0⤋
1) if its $24 for 600 minutes, therefore, they are charged 0.04 per minute so for the next month if they use 450 minutes they will be charged $18
600 minute + $0.04 per minute = $24
450 minute + $0.04 per minute = $18
2) if she reads 560 pages in 10 days therefore she's reading 56 pages per day, so for 392 pages she can read it for 7 days
560 pages + 10 days = 56 pages per day
392 pages + 56 pages per day = 7 days
did you get it?
2006-08-28 06:44:51 · answer #8 · answered by heat 2 · 1⤊ 0⤋
Alright, there is no formula, it is only in your mind.
For the first one, 600 minutes cost $24, so each minute costs 24/600 dollars, or 4 cents. 450 minutes would cost 450 x 0.04 dollars, $18.00. You can work out the second one.
2006-08-28 06:32:33 · answer #9 · answered by tgypoi 5 · 0⤊ 0⤋
1) Cost of surfing per min = $ 24/600 = $0.04 per min
Therefore for 450mins of usage = $0.04 x 450mins = $18
2)Assume average pages read per day :
560pages/10days = 56page per day
Therefore for 392pages : 392/56 = 7 days
I dont think you really need formulas to solve such problems...
2006-08-28 06:34:25 · answer #10 · answered by TEsha 3 · 0⤊ 0⤋