Question

I need help, im a single dad construction worker from los angeles, my daughter is a very smart person. Im having trouble correcting a wrong answer in math. She goes to Kumon academy for math and reading, but this problem im out of words

Answer 1

Answer:

B=210

C=450

Step-by-step explanation:

Since you are asking for number 8, let's work with that problem :)

Firstly, we have to know we have rectangles here, and the area of a rectangle is given by the following formula:

$A_{rectangle}=(width)(height)$

So, in this problem we are given as an example the rectangle $A$, with witdth $90$ and height $30$. So, its area is:

$A=(90)(30)=2700$

The same happens with the small rectangle $B$:

$B=(7)(5)=35$

And, we have to do the same with rectangles $B$ and $C$:

Rectangle $B$:

Width:7

Height:30

$B=(7)(30)=210$

Rectangle $C$:

Width:90

Height:5

$B=(90)(5)=450$

If we sum $A$, $B$, $C$ and $D$ the result must be equal to the total are of the big rectangle:

$A+B+C+D=2700+210+450+35=3395$

Area of big rectangle with width $90+7=97$ and height $30+5=35$:

$(97)(35)=3395$