montgomeryaevans
05.05.2020 •
Mathematics
Rob is a high school student taking both algebra and geometry. Last night he had 27 homework problems combined from the two classes, and he took a total of 90 minutes to do them. If each algebra problem took him 2 minutes and each geometry problem took him 5 minutes, how many algebra problems did he have for homework?
2
5
12
15
Solved
Show answers
More tips
- C Computers and Internet How to insert videos into LiveJournal?...
- C Computers and Internet How Much Does an iPhone Cost in America?...
- F Family and Home How to Choose the Best Diapers for Your Baby?...
- H Health and Medicine Headache: A Comprehensive Guide to Treatment...
- C Computers and Internet How to Properly Order Clothing from International Online Stores...
- A Auto and Moto Mastering One-Movement Parking: All You Need to Know...
- D Dating, Love, Relationships How Long Can Love Last?...
- S Society and Politics Is It Fact or Fiction? Let s Talk About Anton Chekhov s Pseudonym...
- F Food and Cooking How to Find Your Zip Code?...
- S Style and Beauty How to choose the best mascara for your eyelashes...
Answers on questions: Mathematics
- M Mathematics A number x subtracted from 9.8 is greater than -4. Optional question for brainliest: The quotient of a number y and - 3.6 is less than 6.5...
- M Mathematics Two walls in Tiffany s room are the same size. Tiffany paints 1/4 of one wall. Roberto paints 1/6 of the other wall. Who painted a greater amount in Tiffany s room....
- M Mathematics The expression -16t^2 + 1800 models the height of an object t seconds after it had been dropped from a height of 1800 feet. Find the height of an object after falling for 4.8...
- M Mathematics Mark and Amy live 560 miles apart. They are planning to meet somewhere between the two locations. If Mark travels at 20 mph and Amy travels at 50 mph and they leave at the...
Ответ:
15
Step-by-step explanation:
Let x represent the number of algebra problems. Then the number of geometry problems was 27-x and the total working time was ...
2x +5(27 -x) = 90
-3x = 90 -135 . . . . subtract 135
x = -45/-3 = 15 . . . divide by -3
Rob had 15 algebra problems for homework.
Ответ:
23456789
Step-by-step explanation: