x + x - 12 = 51

the number of boys in ninth grade is 12 less than twice the number of girls. there are 51 students in ninth grade. How many are girls?
in Algebra 1 Answers by

Your answer

Your name to display (optional):
Privacy: Your email address will only be used for sending these notifications.
Anti-spam verification:
To avoid this verification in future, please log in or register.

2 Answers

2x - 12 = 51 add 12 to both sides

2x = 63 divide both sides by 2

x = 31.5

check: 31.5 + 31.5 = 63 - 12 = 51      51=51  it checks out
by Level 6 User (15.3k points)
767.90 x 12% =________
by

Related questions

1 answer
51/3-m=12/3
asked Jan 11, 2012 in Algebra 1 Answers by anonymous | 627 views
1 answer
One night while camping, Charlie counts 51 chirps in 25 seconds.
asked Feb 15, 2016 in Other Math Topics by Mathical Level 10 User (57.4k points) | 3.0k views
1 answer
51 of 394 is what %
asked May 28, 2013 in Algebra 1 Answers by anonymous | 688 views
1 answer
-9x - 3 > 51
asked Feb 12, 2013 in Algebra 1 Answers by anonymous | 608 views
1 answer
waht is 5'1 in mm and cm
asked Apr 17, 2012 in Word Problem Answers by anonymous | 686 views
2 answers
51 is 5% of what number?
asked Feb 23, 2012 in Word Problem Answers by anonymous | 2.7k views
Welcome to MathHomeworkAnswers.org, where students, teachers and math enthusiasts can ask and answer any math question. Get help and answers to any math problem including algebra, trigonometry, geometry, calculus, trigonometry, fractions, solving expression, simplifying expressions and more. Get answers to math questions. Help is always 100% free!

Most popular questions within the last 3000 days

  1. 50+50-25X0+2+2= (19)
  2. it takes 10 road workers 5 days to complete a road repair when working 2 hours a day.Working at the same pace,how many days will it take 2 people working 5 hours a day to finish it? (3)
  3. Solve 15 -1(12÷4+1)? (4)
  4. 8:4(5+2) (3)
  5. How can i represent 1/3; 3/3; 7/3; 10/3 and 15/3 on a number line? (1)

Most popular tags

87,516 questions
100,279 answers
2,420 comments
733,259 users