if a/b=0.8 and 6a+11b=79, then a=?
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Answered by
11
a/b = 0.8 ------------- [ 1 ]
6a + 11 b = 79 ------------- [ 2 ]
From equation [ 1 ] :
a/b = 0.8
a/b = 8/10
10a = 8b
b = 10/8 a
b = 1.25 a ------------ Sub into equation [ 2 ]
6a + 11 b = 79
6a + 11 (1.25a) = 79
19.45 a = 79
a = 79 ÷ 19.45
a = 4
Answer: a = 4
Answered by
0
6a + 11 b = 79 ------------- equation [2]
From equation [ 1 ] we get :
a/b = 0.8
a/b = 8/10
10a = 8b
b = 10/8 a
b = 1.25 a ------------ Put this into equation [ 2 ]
6a + 11 b = 79
6a + 11 (1.25a) = 79
19.45 a = 79
a = 79 ÷ 19.45
a = 4
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