Jack spends 1 1/2 times as long on his homework as Jill.
Last week, Jill spent 8 1/2 hours doing homework.
How long did Jack spend doing homework?

12 3/4 hours

Step-by-step explanation:

Jack spends 1 1/2 times as long on his homework as Jill .

Jill spends 8 1/2 in doing his home work .

Time spent by jack in doing his homework is jacks time multiplied by Jill’s

That’s

1 1/2 x 8 1/2

Change to improper fractions.

We have,

3/2 x 17/2

Multiply through

51/4 = 12 3/4

Jack spends 12 3/4 hours in doing his homework

b.my answer is b.

brainliest

a = 3.14

b = 18

c = 18/5 or 3.6 or 3 3/5

step-by-step explanation: