You have to separate the rectangle and the triangle, then find the area of each and add them up.
area of the triangle,
(12×5)÷2=60÷2=30m squared.
area of the rectangle,
12×2=24m squared.
now add them up,
30+24=54m squared.
answer=54m squared
hope this helps......
Suppose x grams of 8% solution should be mixed to make 100 g of 3% solution.
here we shall have:
the amount of 3% solution in the 100 g will be:
3/100*100=3 grams
the the equation will be, 8% of what quantity becomes 3g?
(8/100)*x=3
hence solving for x we shall have:
0.08x=3
x=3/0.08
x= 37.8 grams
The implication of this is that, when you have 37.5 grams of 8% solution, that will contain 3 of pure chemical and hence when you add more solvent on top of 37.5 g until you reach 100g, that will be 3% solution.
To answer this, you will first need to simply the expressions.
Now with the expressions simplified, you'll add the two together getting 
15x-6
21x/2+3. Multiply everything by 2: 30x-12=21x+6. Combine like terms: 9x=18. Get the unknown by itself: 9x/9=X. 18/9=2. X is less than or equal to 2 :)
