Question

Bob ate 10 carrots and 7 hershey's kisses and the total calories were 263. fred ate 4 carrots and 8 hershey's kisses and the total calories were 230. how many calories are in a carrot and a hershey's kiss? (the answer is not a scientific truth, only made up numbers!!!)

Answer 1

two equations 

let c the calories in carrot
let h the  calories in hershey's kisses


4c + 8h = 230                eq 1
10 c + 7 h = 263             eq 2  


to solve the solution  we multiply eq  1 by 10 
we multiply eq  2 by 4

40 c + 80 h =  2300
40c + 28 h = 1052 

we subtract the two equations we get
 52  h = 1248 

h= 24 

and so in replacing h = 24 in the equation we get c = 9.5