The perimeter of two similar triangles abc and pqr are 25cm and 15cm respectively. if one side of the first triangle is 9cm. find the corresponding side of another triangle

The answer is:    " 5  cm "  ;  

or, write as:         " 5. 4 cm " .

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25/15 = 9 /x  ;

Reduce the "25/15 " :

→  " (25/15)  =  (25÷5) / (15÷5)  =  "(5/3)" ;

→  And rewrite:  

→  5 / 3  =  9 / x  ;

Cross-multiply:

→  5 x  = 3 * 9  ;

→  5x   =  27  ;

Divide each side of the equation by "5" ;   as follows:

→  5x / 5  = 27 / 5 ;

to get ;

→   x =  27 / 5 ;

       =   {27 ÷ 5} ;

→  x  =  " 5  cm "  ;  

or, write as:  " 5. 4 cm " .

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step-by-step explanation:

to determine the unit cost your would divide the total cost by the number sold.

7 bagels for $4.41       $4.41/7 = $.63 each at fresh side

5 bagels for $3.60         $3.60/5 = $.72 each at value mart