a radio uses the energy equivalent of 1/20 ton of coal per year, find the enrgy equivalent in tons of coal for operating a radio for 4 years?
if it takes 2 1/3 yards of material to make a shirt, how many shirts can be made from 7 yards of material?
2006-07-08 18:43:03 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Well, you can say that a radio operating 4 years would use (1/20)*4 tons of coal, or 1/5 of a ton. If you want to be funny, you could add 1/(20*365) tons to that total because of February 29 in the leap year.
As to the other problem, 2 and 1/3 yards = 7/3 yards of fabric. 7 yards divided by 7/3 yards = 3 shirts.
2006-07-08 18:47:39 · answer #1 · answered by anonymous 7 · 0⤊ 0⤋
very easy,
energy used by radio per year equiivalent to=1/20 tones of coal
energy used by radio in for year equiivalent to=1/20.4=1/5
1 shirt=2 1/3 yards=7/3 yards
1 yard material can make= 3/7 shirts
7 yards can make = 3/7.7=3 shirts
2006-07-09 02:09:32 · answer #2 · answered by vishal jha 2 · 0⤊ 0⤋
1/20 ton/yr x 4 yrs. = 4/20 ton = 1/5 ton
7 yards divided by 2 1/3 yards/shirt = 7 yards divided by 7/3 yards/shirt = 7 yards x 3/7 shirt/yard = 3 shirts
2006-07-09 01:52:11 · answer #3 · answered by G.V. 6 · 0⤊ 0⤋
1.
1 ton of coal
--- ------------- X 4 years
20 year
cross out year, therefore:
1 /20 ton of coal X 4 = 4/20= 1/5 tons of coal
2.
2 1/3 = 7/3 yards/shirt
7 yards
----------------------
7 yards
-- --------
3 shirts
cross out yards, therefore:
21 shirts
----- = 3 shirts
7
2006-07-09 03:46:48 · answer #4 · answered by Anonymous · 0⤊ 0⤋
1/5 of a ton of coal would be needed for the first question and then you would be able to make 3 shirts.
2006-07-09 01:46:46 · answer #5 · answered by Disillusioned 5 · 0⤊ 0⤋