plz help me to do the questions.If you do not no the answer,Plz answer no!Thx~
1.Simplify:
0.4:0.16
2.The ratio of David's weight to Jim's weight is 5:7.If Jim's weight is 49kg,what is David's weight?
3.If a:b=5:4 and b:c=6:5,find a:b:c.
Is the answer a:b:c=30:24:20?YES or NO?
4.Find the rate of the following in the unit indicated:
(a) 15 revolutions in 5 minutes (rev./min)
(b) 100km in 8 hours(km/h)
f.1 math (ratio) questions
2007-07-23 3:41 am
回答 (2)
2007-07-23 3:57 am
✔ 最佳答案
1)0.4 : 0.16
= 40 : 16 ( 兩邊 x 100 )
= 5 : 2 ( 兩邊除 8 )
_______________________________
2)
David's weight
= 49 x ( 5 / 7 )
= 35 kg
_______________________________
3)
NO.
a : b : c = 15 : 12 : 10
________________________________
4a)
15 revolutions in 5 minutes
= 15 rev. / 5 min.
= 3 rev. / min. ( 兩邊除 5 )
4b)
100 km in 8 hours
= 100 km / 8h
= 12.5 km / h ( 兩邊除 8 )
2007-07-23 3:56 am
first, ' If you do not no the answer ' not (no), is know
but u should do yourself wor..
1) 0.4
2) David's weight :35kg
5 : 7
? :49
3) Ys, u are right.
4) 3rev./min 15/5 =3
12.5km/h 100/8 = 12.5
ok?
but u should do yourself wor..
1) 0.4
2) David's weight :35kg
5 : 7
? :49
3) Ys, u are right.
4) 3rev./min 15/5 =3
12.5km/h 100/8 = 12.5
ok?
參考: myself ^^
收錄日期: 2021-04-12 20:37:45
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