Maria is 6 times as old as Tina. In 20 years, Maria will be only twice as old as Tina. How old is Maria now?
A. 25
B. 28
C. 29
D. 30
E. 32
Let x be Maria’s and Tina’s ages, since Maria was 6 times as old as Tina, then: 6x = x. 20 years from now Maria will be 6x + 20 twice of that of Tina’s x + 20. Then: 6x + 20 = 2(x + 20) ⇒6x + 20 = 2x + 40 ⇒ (collect like terms): 4x = 20 ⇒ x = 5. Therefore, since x = 5 and Maria age is 6x, then: 6 × 5 = 30. The answer is (30).
If a secretary types 60 words per minute, how many minute will he take to type 330 words?
A. 11/2
B. 15/2
C. 16/3
D. 17/2
E. 19/4
Since the secretary types 60 words per minute:
60 words = 1 minute Then: 330words =?
Then the secretary will be able to type: = .330 words x 1minute / 60 words= 11/2 minutes The answer is 11/2
If Scott can mow 2/5 of a lawn each hour, how many lawns can he mow in h hours?
A. 2h/5
B. 5h/2
C. h - 2/5
D. 2/5h
E. 5/2h
Solution Since a specific hour was not given on how he mows the lawn, let use 42hours since there are 24 hours in a day, it will give: 2/5 of 24 = .48/5 Now for h hours he will mow the lawn for: 2/5 of h = 2h/5 (note of means multiplication). The answer is (A).
If it is now June, what month will it be 100 months from now?
A. January
B. April
C. June
D. October
E. December
Since 100 = 12 × 8 + 4, 100 month is 4 month more than 8 years. Therefore, 8 years from now it will again be June, and 4 month later it will be October. The answer is (D).
In a group of 100 students, more students are on a team than are members of a club. If 70 are in clubs and 20 are neither on a team nor in a club, what is the minimum number of student who could be both on a team and in a club?
A. 61
B. 62
C. 65
D. 70
E. 75
Solution Draw a Venn diagram letting x be the number of student both on a team and in a club. Since more student are on a team than in a club, 10 + x > 70 ⇒ x > 60. Since x must be an integer, the minimum it can be is 61. The answer is (61).