Question 353572: The average of a and b is 18, and the ratio of a to b is 5 to 4. what is the value of a - b ? Found 2 solutions by mananth, ewatrrr:Answer by mananth(16946) (Show Source):
You can put this solution on YOUR website! Average of a & b = 18
so sum of a&b = 2*18=36
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5/9 + 36 = a= 20
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4/9 * 36 = 16 = b
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CHECK
20/16 = 5/4
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20+16 =36 /2 = 18 the average.
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m.ananth@hotmail.ca
You can put this solution on YOUR website! Hi,
.
Question states
b = 36 - a
.
and
a = (5/4)b
.
b = 36 - (5/4)b
b + (5/4)b = 36
2(1/4) b = 36
(9/4)b = 36
b = 36*(4/9)
b = 16
a = (5/4)16 or 20
.
calculate
a - b
