Question the-nu

3.2 Percentages - Successive percent changes
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The number w is 110% greater than the number z . The number z is 55% less than 50 . What is the value of w ?

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The number w is 110 % greater than the number z . The number z is

Hard-difficulty · SAT Math · Percentages — Successive percent changes. Read the question above, select your answer, and check the full explanation below to understand exactly why the correct choice works.

Answer explanation

The correct answer is 47.25 . It’s given that the number w is 110% greater than the number z . It follows that w=1+110100z, or w=2.1z. It’s also given that the number z is 55% less than 50 . It follows that z=1-5510050, or z=0.4550, which yields z=22.5. Substituting 22.5 for z in the equation w=2.1z yields w=2.122.5, which is equivalent to w = 47.25 . Therefore, the value of w is 47.25 . Note that 47.25 and 189/4 are examples of ways to enter a correct answer.