Joselyn is a manager at a sign-painting company. she has two painters, allen and brianne. allen can complete a large project in 16 hours. brianne can complete the project in 18 hours. joselyn wants to know how long it will take them to complete the project together. write an equation and solve for the time it takes allen and brianne to complete the project together. explain each step.

c.   x=2.4cm

step-by-step explanation:

similar triangles are triangles which have the same shape but not the same size. this means their angle measures are equal but their side lengths are not instead they are proportional. to solve, we will set up a proportion and solve.

a proportion is two equal ratios set equal to each other. we form the ratios by finding corresponding sides (sides which match to each other on both triangles by their position). out ratios will be one side of the small triangle over the corresponding side on the big triangle as shown below:

.

to solve the proportion, we'll cross multiply by multiplying numerator with denominator across the equal sign.