Step-by-step explanation:
1/3x-10/3=-4
1/3x=-4+10/3
1/3x=-2/3
x=-2
<span>First convert it to a decimal by dividing the denominator into the numerator:
We get:
27/40=0.675
Then move the decimal point two places to the right (multiply by one hundred) to convert it to percent form:
67.5%</span>
calculate area of wall
20 x 1.5 = 30 square meters
now calculate area of 1 block
12 x 18 =216 square centimeters
convert cm to meters 1 cm^2 = 0.0001m^2
so 216 x 0.0001 = 0.0216 sq meter for 1 block
divide area of wall by area of block
30/0.0216 = 1388.88 so 1389 blocks are required.
