Question 502217
Let x = the number of customers who ordered decaffeinated coffee, then x+126 cutomers ordered regular coffee, so we can right a proportion:
{{{4/1 = (x+126)/x}}} Solve for x. Cross-multiply.
{{{4x = x+126}}} Subtract x from both sides.
{{{3x = 126}}} Divide both sides by 3.
{{{x = 42}}}
42 customers ordered decaffeinated coffee and 168 (42+126) customers ordered regular coffee.
Check:
{{{168/42 = 4/1}}}