Question 647984
Let's begin by breaking up what is given to us in the word problem.

Number of calories in Burger King's Chicken Caesar Salad: {{{x}}} <-- because it's the unknown
Number of calories in Taco Bell's Express Salad: {{{x + 125}}} <-- because it has 125 more calories than the Burger King Chicken Caesar Salad
Number of calories in Wendy's Mandarin Chicken Salad: {{{x + 95}}} <-- because it has 95 more calories than the Burger King Chicken Caesar Salad
Total of all the salad calories put together: {{{1750}}} <-- We know that the sum of all the numbers will have to equal this

Step 1: Add all of the factors together, and set the sum equal to 1750

{{{x + x + 125 + x + 95 = 1750}}}

Step 2: Combine like terms

{{{x + x + 125 + x + 95 = 1750}}}
{{{3x + 220 = 1750}}}

Step 3: Subtract '220' on both sides to get '3x' by itself

{{{3x + 220 = 1750}}}
{{{3x = 1530}}}

Step 4: Divide both sides by '3' to get 'x' by itself

{{{3x = 1530}}}
{{{x = 510}}}

We know now that the number of calories in the Burger King Chicken Caesar Salad is {{{x = 510}}}

To find the amount of calories in the other two salads, simply just add {{{510}}} to the other two equations we came up with at the beginning of the problem.

Step 1: Number of calories in Taco Bell's Express Salad: {{{x + 125}}}

Take {{{510}}} and add it to {{{125}}} to find the number of calories.

{{{x + 125}}}
{{{510 + 125}}}
{{{635}}} 

The number of calories in Taco Bell's Express Salad is {{{635}}} 

Step 2: Number of calories in Wendy's Mandarin Chicken Salad: {{{x + 95}}}

Take {{{510}}} and add it to {{{95}}} to find the number of calories.

{{{x + 95}}}
{{{510 + 95}}}
{{{605}}}

The number of calories in Wendy's Mandarin Chicken Salad is {{{605}}}

So... here are your answers:

The number of calories in Burger King's Chicken Caesar Salad is {{{510}}}
The number of calories in Taco Bell's Express Salad is {{{635}}} 
The number of calories in Wendy's Mandarin Chicken Salad is {{{605}}}