![]() How long will it take them to mow the lawn together? ![]() Barney can mow the lawn in 5 hours, and Fred can mow the lawn in 4 hours. We can see that x decreases when x is decreased.ģ. However, the choices give us the possibility of I & II, so we must check out II as well.Īgain, this does what the questions asks. We can see that x decreases as the equation decreases. We know that I does what the question asks. Substitute a simple number you can work with quickly. The easiest way to solve this problem is to work from the answers, eliminating the wrong answers. If x > 1, which of the following decreases as x decreases?Īnswer choices: (F) I only (G) II only (H) III only (J) I & II only (K) II & III Substitute 3 for the x in the 2nd equation. You must go on to the second part of the question (3x + 1 = ?) Always be careful on two-part questions. When you solve for x in the first equation (x + 6 = 9) you get 3, which is choice A.īut that is not the question. Choice A is to tempt you into a quick (wrong) decision. Math Review for ACT College Entrance ExamĪnswer choices: (A) 3 (B) 9 (C) 10 (D) 34 (E) 46
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