a math test is made up of 5point and 10point questions. there are 24 questions on the test. the total number of possible points is 150points
What is the total value of all the 10-point questions on test

Question

a math test is made up of 5point and 10point questions. there are 24 questions on the test. the total number of possible points is 150points    
  What is the total value of all the 10-point questions on test

anonymous · Answer

let x be the no. of 5 points question and y be the no. of 10points question.
x + y = 24  , x = 24-y----------->    i.)
5x + 10y = 150
5(24-y) +10y=150
120-5y+10y=150
5y=150-120
5y=30
y=6

Total value of 6 10point question = 6*10 = 60

anonymous · Answer

thanks