## Rapid Maths Important Examples

### Brief

Math Examples, Solutions and Discussions

### Description

In this group you will find:

• Important Mathematical examples and their solutions
• Important Mathematical concepts
• Comprehensive explanation on every step
• Learning Tricks

If you find a step hard to understand, you can participate in the discussion. You can also submit any Mathematical query you wish to be resolved.

If you have any test specific query in quant that you wish to be resolved you can go to Official Quant Prep Group | QS-LEAP

### Discussion

• 2017-01-08 John uja

HELLO?
WE ACTIVE HERE?

• 2016-11-01 Fire Storm

you have to use this formula: #AUB = #A +#B -#A intersectionB:
25 = 15 + 21 - #A intersection B
#A intersection with B : 11

• 2016-11-01 Shuna Bako

There are 25 trays on a table in the cafeteria. Each tray contains a cup only, a plate only, or both a cup and a
plate. If 15 of the trays contain cups and 21 of the trays contain plates, how many contain both a cup and a plate?
A. 11
B.18

C.6
D.3
E.12

• 2016-10-18 Himanshu Math Tutor

(d/k)*100

• 2016-10-11 obed antwi

There are k gallons of gasoline available to fill a tank. After d gallons have been pumped, in terms of k and d, what percent of the gasoline has been pumped?

• 2016-09-23 Victor Suzin

Hello Himanshu,

Wouldn't it be Girls=2xBoys ?
The resolution above is considering the opposite way.

In that case, the correct answer would be 65%.
Do you agree with me?

• 2016-09-12 Himanshu Math Tutor

Can you post a snapshot of the equation with the question.Unable to understand it.

• 2016-09-09 Obed Antwi

**18.16^0.0125** that's the function.

• 2016-09-09 Obed Antwi

Lúcia
posted a video of her cat playing on the piano. She found that the
following expression modeled the total number of people who had viewed
her video tttt days after she posted it.
18⋅160.0125t\qquad {18\cdot16^{0.0125t}}18⋅16​0.0125t​​space, 18, dot, 16, start superscript, 0, point, 0125, t, end superscript
After
how many days did the total number of people viewing the video double
from the original number of people? Round to the nearest day.

• 2016-09-04 Himanshu Math Tutor

lets say there are x girls
So number of boys = 2x
70% of girls didn't hand their book report
i.e. 0.7 x students
55% of boys didn't hand their book reports
i.e. 0.55 * 2x = 1.1 x

total students that didn't hand book reports = 0.7x + 1.1x = 1.8x

% of students that didn't submit the book report = 1.8x / 3x * 100 = 60%

• 2016-09-02 Obed Antwi

There are twice as many girls as boys in an English class. If 30% of the girls and 45% of the boys have handed in their book report , what percent of the students have not yet handed in their reports

• 2016-06-27 Himanshu Math Tutor

Shortest distance between lines: Coordinate Geometry
What is the shortest distance between the lines
x + y = 6 and 4x + 4y = 32
?

Solution:
Slope of both the lines is -1 hence they are parallel so minimum distance is not 0.

Equation 1 : x + y = 6
Standard form : x + y - 6 = 0

Equation 2: 4x + 4y = 32 reducing this equation x + y = 8
Standard form : x + y - 8 = 0

comparing the equations to ax + by + c = 0

we get value of a = 1, b = 1 for both the lines
for the first line c1 = -6
for the second line c2 = -8

formula for distance between the lines : |c1 - c2| / √(a^2 + b^2) (for more details about the formula PM me)
distance = |-6 - (-8)| / √(1^2 + 1^2) = 2 / √2 = √2

• 2016-06-22 Himanshu Math Tutor

Go to your dashboard. GRE Quant section is under the heading "GRE Problem Solving".

• 2016-06-13 kodimyala nikhitha

i cant find quant preparation test.can you help me in dat?

June 15, 2017

June 15, 2017

June 10, 2017

April 17, 2017

March 30, 2017