this is a maths question. i don't know how to do this sum. this question is on the topic ratio and proportion. this is a secondary 1 sum.
2006-07-17 22:07:47 · 16 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
product of the means = product of extremes
4:7 = x:5
7x = 4(5) or you simply just cross multiply
7x = 20
x = 20/7 solve for x
or
x = 2 6/7
2006-07-17 22:35:01 · answer #1 · answered by Querilous 4 · 2⤊ 1⤋
The way to handle the problem 4/7 = X/5 is to:
1) Cross multiply to get rid of the fractions and make things look a little better. This would give you 20 = 7X.
2) Now you look at what's being done to X, which is multiplying it by 7. To get X's value, you do the exact opposite, which would be to divide by 7.
This gives you X = 20/7 or roughly 2.86
2006-07-19 04:02:08 · answer #2 · answered by msoexpert 6 · 0⤊ 0⤋
This is a proportion problem
4 : 7 = x : 5
7x = 20
Multiply the means 7x
multiply the extremes 4(5) = 20
7x/7 = 20/7
Divide both sides by 7
x = 2.857142857
x = 2.8
Rounded to one deximal place
2006-07-18 05:28:40 · answer #3 · answered by SAMUEL D 7 · 0⤊ 0⤋
x=20/7
2006-07-18 05:44:46 · answer #4 · answered by budweiser 2 · 0⤊ 0⤋
20/7
2006-07-18 09:25:31 · answer #5 · answered by ss 2 · 0⤊ 0⤋
4:7 = x:5
4/7 = x/5
7x = 4*5
7x = 20
x = 20/7
2006-07-18 05:22:52 · answer #6 · answered by M. Abuhelwa 5 · 0⤊ 0⤋
4:7 = x:5
4/7 = x/5
Cross multiply
7x = 20
x = (20/7)
ANS : 20:7
2006-07-18 09:01:44 · answer #7 · answered by Sherman81 6 · 0⤊ 0⤋
Answer: 2.85714285714
Solution:
4:7 = since 4 is 1.75% of 7 (4*1.75=7)
So: X:5 =(5/1.75)= 2.85714285714
2006-07-18 05:15:12 · answer #8 · answered by judy 3 · 0⤊ 0⤋
Look the question in this way: 4/7 = x/5
Then u use cross-mutiply,
(4)(5)=(7)x
20=7x
x=2.86
Clear? Any prob can aske me (:
2006-07-18 05:12:48 · answer #9 · answered by a V a 4 · 0⤊ 0⤋
4:7=x:5
or, 4/7 = x/5
or, x = 4*5/7=20/7
2006-07-18 05:12:55 · answer #10 · answered by Lutfor 3 · 0⤊ 0⤋