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Pedro spent 2 1/5 hours on his math homework and half as long on his science homework one weekend. If his English and social studies homework took 7/8 as long, how much time did he spend on homework that weekend?? PLZZ HELP ILL WILL BE MARKING WHOS BRAINLIEST!?!?!

Respuesta :

emma82310

2 1/5 hours on homework for math = 2.2

Science homework took 1.1 hours to complete.

2.2+1.1= 3.3

7/8 of an hour is 50 minutes because we know that an hour is 60 minutes and every 10 minutes is a number for the numerator, if that makes sense.

3.3 of an hour plus 50 minutes, would equal 3.8 since the 3 after the point would be minutes. To convert into hours, since an hour is 60 minutes, we have 4 hours and 20 minutes he spent on homework over the weekend. That would be your answer! Hope this helped.

Answer: He spent 5 hours and 13.5 on homework

Step-by-step explanation:

Hi, to answer this question we have to analyze the information given:

  • Time spent on math homework: 2 1/5 hours
  • Since he spends on science homework half of the time (1/2) he spent on math  : 2 1/5 x 1/2 = 1 1/10  hours
  • Time spent on English and social studies homework:  2 1/5 x 7/8 = (5x2+1)/5 x 7/8 = 11/5 x 7/8 = 77/40  hours

Now, we simply add all the results:

2 1/5 + 1 1/10 +77/40= 2 8/40 + 1 4/40 +77 /40 = 3 89/40  

Simplifying:

3 +40/40 + 40/40 +9/40 = 3+1+1+9/40 = 5 9/40

Since 60 minutes = 1 hour

9/40 x60 = 13.5 minutes

He spent 5 hours and 13.5 on homework

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