Atextbook store sold a combined total of 409 chemistry and physics textbooks in a week. the number of physics textbooks sold was 43 less than the number of chemistry textbooks sold. how many textbooks of each type were sold?

The textbooks of each type sold were 226 chemistry and 183 physics.

Step-by-step explanation:

Given:

A textbook store sold a combined total of 409 chemistry and physics textbooks in a week.

The number of physics textbooks sold was 43 less than the number of chemistry textbooks sold.

Now, to find the textbooks of each type were sold.

Let the number of chemistry textbooks sold is

And the number of physics textbooks sold is

Total combined of both textbooks sold = 409.

According to question:

Adding 43 on both sides we get:

Dividing both sides by 2 we get:

Number of chemistry textbooks are 226.

Number of physics textbooks =

Therefore, the  textbooks of each type sold were 226 chemistry and 183 physics.

unless you made a typo, the answers are both a and c.

step-by-step explanation:

1.5/3 is .5 whereas 3/9 is .3333333 not proportional

22/33 is .66666 and 4/6 is also .66666 proportional

2/4 is .5 whereas 142/213 is .66666 not proportional

14/7 is 2 and 7/3.5 is also 2 proportional

you could've also checked it by doing this simple division:

if the larger fraction divides with the smaller fraction to equal 1, it is proportional. so let me show you what i mean:

when i divide 22/33 by 4/6 i get 1, so we know it is proportional, and it is the same with 14/7 and 7/3.5. now if i divide 3/9 by 1.5/3 i get .66666 so therefore we know it is not proportional.

there are many ways to do this so i wanted to show you some possible ways.

the answer is a and d