An architect designs apartment buildings with the same ratio of small to large apartments. Building A has 12 small apartments and 6 large apartments. Building B has 18 small apartments.

9 large apartments in B

Step-by-step explanation:

Same ratio

Building A = 12 small : 6 large

= 2 : 1

Building B = 18 small : x large

= 2 : 1

18/x = 2/ 1

18 = 2x

9 = x

Large apartments in B = 9

step-by-step explanation:

12: 00 p.m. to 7: 00 p.m. is a total of 7 hours.

4: 00 p.m. to 7: 00 p.m. is a total of 3 hours.

this means that from 4: 00 p.m to 7: 00 p.m. this represents 3/7 of what was lost from 12: 00 p.m. to 7: 00 p.m.

after knowing this, after doing 11,600 - 6,800 = 4,800

4,800 represents 3/7 of what was lost for 7 hours.

we then divide 4,800 by 3 which gets 1,600.

because we know that 1,600 represents 1/7 of how much water was lost, we just have to multiply by 7, which gets 11,200.   after adding 11,200 to how much water was left at 7: 00 p.m. which was 6,800. 11,200 + 6,800 = 18,000

this means that the pool originally had 18,000 gallons in the pool.

you can also check your work by doing 18,000 - 4(1600), which becomes           1800 - 6400 which gets you 11,600.

its 60

4 x 12 = 48

3 x 4 = 12

48 + 12 = 60

yeeeet