(a+2):(a+5):b=3:4:7
Please list out the step clearly and more detail .Thank you.
Maths{20 marks}
2010-05-08 2:53 am
回答 (2)
2010-05-08 3:00 am
✔ 最佳答案
(a+2):(a+5):b=3:4:7(a+2) : (a+5) = 3 : 4 and (a+5) : b = 4 : 7
3(a+5) = 4(a+2) and 4b = 7(a+5)
3a + 15 = 4a + 8 and b = (7/4)(a+5)
a = 7 and b = (7/4)(7+5) = 21
Answer : a = 7 , b = 21
Hope I can help YOU !!!!
2010-05-08 3:44 am
(a+2):(a+5):b=3:4:7
(a+2) : (a+5) = 3 : 4 and (a+5) : b = 4 : 7
(a+2) / (a+5)=3/4 and (a+5) / b=4/7
3(a+5) = 4(a+2) and 4b = 7(a+5)
3a + 15 = 4a + 8 and b = (7/4)(a+5)
a = 7 and b = (7/4)(7+5) = 21
Answer : a = 7 , b = 21
Hope you will understand!!!
(a+2) : (a+5) = 3 : 4 and (a+5) : b = 4 : 7
(a+2) / (a+5)=3/4 and (a+5) / b=4/7
3(a+5) = 4(a+2) and 4b = 7(a+5)
3a + 15 = 4a + 8 and b = (7/4)(a+5)
a = 7 and b = (7/4)(7+5) = 21
Answer : a = 7 , b = 21
Hope you will understand!!!
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