The three Math Idol judges have been eliminating contestants all day! The number of one-step equations and two-step equations who have been eliminated today is equal to 840! If three times the number of one-step equations minus twice the number of two-step equations is equal to 870, how many one-step equations auditioned today?
Answer

510

660

520

330

Question

The three Math Idol judges have been eliminating contestants all day! The number of one-step equations and two-step equations who have been eliminated today is equal to 840! If three times the number of one-step equations minus twice the number of two-step equations is equal to 870, how many one-step equations auditioned today?
Answer
		
510
		
660
		
520
		
330

anonymous · Answer

o + t = 840
3o - 2t = 870

=> 5o = 1680 + 870
=> o = 2550/5
=> o = 510