Numeric Entry GRE Sample Questions 1
GRE Numeric Entry Sample Questions
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1. Question :A light bulb blinks at 12 noon. It then blinks after 4 seconds, then after 8 seconds, then after 12 seconds and so on.
How many times shall it have already blinked until it blinks at12.08pm?
Correct Answer: 15Explanation:
The seconds after which the light bulb blinks are 0, 4, 8, 12 â€¦These form an AP with common difference 4 and first term 0.
Let the number of times it blinks in 8 minutes be n.
Sum of n terms = 8*60 = 480
Sum of n terms in an AP where a is the first term and d is the common difference is given by
Sn = (n/2)[2a+(n-1)d]
(n/2)[2*0+4(n-1)] = 480
2n^2-2n-480=0
n^2-n-240=0
n^2-16n+15n-240=0
n(n-16)+15(n-16)=0
n=16
The bulb had already blinked 15 times before it blinked at 12.08 pm
2. Question :
The weight of a woman reduces by 10% every year. If she weighs 100kg today, then after how many years will her weight be 72.9 kg?
Correct Answer: 3 yearsExplanation:
This problem is similar to a compound interest problem where the rate is negative. Let the number of years be n.
Weight = 100(1-10/100)^n = 72.9
100(0.9)^n = 72.9
(0.9)^n = 0.729
n = 3
Her weight will be 72.9 kg afer 3 years
3. Question :
The LCM of 3/4, 5/6 and 7/8 is ..../2. Fill in the blank with the appropriate number.
Correct Answer: 105Explanation:
LCM of 3, 5 and 7 = 3*5*7 = 105
HCF of 4, 6 and 8 = 2
Required LCM = 105/2
The number to be filled in the blank is 105
GRE Numeric Entry Sample Questions
GRE Numeric Entry Sample Questions 1 | GRE Numeric Entry Sample Questions 2 | GRE Numeric Entry Sample Questions 3 | GRE Numeric Entry Sample Questions 4 | GRE Numeric Entry Sample Questions 5 | GRE Numeric Entry Sample Questions 6 | GRE Numeric Entry Sample Questions 7 | GRE Numeric Entry Sample Questions 8 | GRE Numeric Entry Sample Questions 9 | GRE Numeric Entry Sample Questions 10