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In a shop, there are 25 bicycles and tricycles. there are 63 wheels in all.find the numbers of bicycles and tricycles in the shop.

Respuesta :

randgh

let x be  number of bicycles
 and y the number of tricycles
So 

x + y = 25  equation 1

The number of wheels is
2x + 3y = 63  equation 2 



We can multiply the  equation 1  by two and subtract from the second one...
2x + 3y = 63
-(2x + 2y = 50)
 then  

y = 13 trikes and 
x = 12 bikes

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