The average price of 20 paint brush is $15 while average prices of 18 of those is $12 . for the remaining 2 brushes the prices of 1 is 40% more than that of other?
1. The average price of 20 paint brush is $15 while average prices of 18 of those is $12 . for the remaining 2 brushes the prices of 1 is 40% more than that of other?
Solution:
Price of first brush in remaining two brushes =x
Then price of second brush=1.4x(according to question)
The total price of 20 brushes=20*15=300
The total price of 18 brushes=18*12=216
Then price of remaining 2 brushes= 300-216=84
Now,
Price of first brush +price of second brush =84
x + 1.4x = 84
2.4x=84
x=84/2.4
x=35
Then
Price of first brush is x = 35
Price of second brush 1.4x=1.4 * 35=49
Answer : first brush is $35 and second brush is $49.
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