Io8 ARITHMETIC. 



3. Multiply the second and third terms together, dlvid<? 

 the product by the first, and the quotient will be the 

 answer. 



Note r. 



2. Bring the first and third numbers into the same denomina- 

 tion, and the second into the lowest name mentioned. 



3. Multiply the second and third numbers together, and divide 

 the product by the first, and the quotient will be the answer to the 

 question, in the same denomination you left the second number 

 in ; which may be brought into any other denomination required.. 



EXAMPLE. 



If 241b. of raisins cost 6s. 6d. what will iS frails cost, eacl^ 

 weighing net 3qrs. i81b. ? 



241b. ; 6s. 6d. :: 18 frails, each 3qrs. 1 81b. : 

 12 28 



78 > 102 



18 



8i6 



.02 



1835 

 73 



14688 

 12852 

 12 



34)143208 ( 5967 

 232 ■ 

 160 2,0)49,7 $ 



j68 



Ans. 24I. 17s. 3d. — £-2^ 17 3 



The rule is founded on this obvious principle, that the magni- 

 tude or quantity of any effect varies constantly in proportion to 

 the varying part of the cause : thus, the quantity of goods bought 

 is in proportion to the money laid out ; the space gone over by an 

 uniform motion is in proportion to the time, &c. The truth of 



the 



