(MARKING BRAINLIEST FOR THE ANSWER WITH AM EXPLANATION) If 3/10 of the people in a water aerobics class are over age 56 and 2/5 of the people in the class are under age 40, what fraction of the people in the class are either over 65 or under 40

7/10 of the people in the class were either over 65 or under 40.

Step-by-step explanation:

2/5 = 4/10 people are under 40.

3/10 people are over 56.

3/10 + 4/10 = 7/10.

7/10 of the people in the class were either over 65 or under 40.

Hope this helps!

here the number -5 is all of the following except a rational number.

step-by-step explanation:

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.