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operations on rational numbers
On a scale that measures the intensity of a certain phenomenon, a reading of n+1 corresponds to an intensity that is 10 times the intensity corresponding to a reading of n. On that scale, the intensity corresponding to a reading of 8 is how many times as great as the intensity corresponding to a rea...
- by marat_isr
Fri Mar 03, 2017 8:37 am- Forum: Problem Solving
- Topic: operations on rational numbers
- Replies: 5
- Views: 2844
Proportion
In a certain business, production index p is directly proportional to efficiency index e, which in turn directly proportional to investment index i. What is p if i=70?
1) e=0.5 whenever i=60
2) p=2.0 whenever i=50
- by marat_isr
Thu Mar 02, 2017 10:18 am- Forum: Data Sufficiency
- Topic: Proportion
- Replies: 3
- Views: 3203
Algebra
The price of lunch for 15 people was $207.00 including a 15% gratuity for service. what was the average price per person, excluding the gratuity?
a) $11.73
b) $12.00
c) $13.80
d) $14.00
E) $15.87
Why is it wrong to get the price before the gratuity by simply multiplying 207*0.85 ?
- by marat_isr
Tue Feb 28, 2017 8:38 am- Forum: Problem Solving
- Topic: Algebra
- Replies: 7
- Views: 3876