Andy can paint a car in 21 hours. Three hours after he starts, Katie is put on the same job. Together they finish the work in 5 more hours. How long would it have taken Katie working alone?

cut 138 centimeters off

step-by-step explanation:

250-112 = 138

b mark me branliest thx

step-by-step explanation:

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116