As shown in the figure, after the triangle on the left is reduced to a certain scale, the triangle on the right can be obtained. Find the unknown X. unit (CM)

As shown in the figure, after the triangle on the left is reduced to a certain scale, the triangle on the right can be obtained. Find the unknown X. unit (CM)

Reduce by a certain proportion, that is, the corresponding line segments are reduced by proportion
So, X: 6 = 12:18
X = 4 (CM)

Enlarge the triangle on the left to get the triangle on the right. Find the length of a right angle side a and a hypotenuse side B of the right triangle
Unit: centimeter the length of the left triangle is 4 wide 3 high 5 the length of the right triangle is 6 wide a high B
For a job, 8 people need to complete it in 24 days. If the work efficiency is the same, how many days does 12 people need to complete it? (proportion answer)

4:6=3:a=5:b a=4.5 b=7.5
1:12x=1:(8*24)

Make up a problem: make up an application problem, make the unknowns meet the equations
x+y=3100,
(1+6%)x+(1-2%)y=3100*(1+4.4%)

A solution has 3100g in total. If the solvent increases by 6% and the solute decreases by 2%, the solution increases by 4.4%?
Let X G be the original solvent and Y G be the solute
x+y=3100
(1 + 6%) x + (1-2%) y = 3100 * (1 + 4.4%) = > x = 2480, y = 620 answer