Question

How many calories in the candy bars

Answer 1

A = 267 calories; B = 257 calories

Explanation:

We can set up a system of equations to find how many calories each candy bar provides.

The information gives us:

A + 2B = 781 and 2A + B = 791.

Substitution will be easier, and we can isolate A from the first equation and then plug it in for A in the second equation:

`A+2B=781\\2A+B=791\\\\A=781-2B\\\\2(781-2B)+B=791\\1562-4B+B=791\\1562-3B=791\\-3B=-771\\B=257`

Now we can plug in B into the first equation to find A:

`A+2(257)=781\\A+514=781\\A=267`