Question 1055104
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Out of 13 cows, one worth RS 625 was removed and a horse was included.
If the average price of the animal increased by RS 15, 
find the price of the horse?
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Your equation is

{{{(C[12] + 625)/13}}} - {{{(C[12]+x)/13}}} = -15,

where {{{C[12]}}} is the cost of the remaining 12 cows.


Multiply by 13 both sides, cancel {{{C[12]}}} and then find x.
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