Ask questions which are clear, concise and easy to understand.
Ask QuestionPosted by Nabeel Hasan 5 years, 11 months ago
- 1 answers
Posted by Rishi Raj Singh Jadon 5 years, 11 months ago
- 4 answers
Shourya Singh 5 years, 11 months ago
Yogita Ingle 5 years, 11 months ago
Let the price of one book be y
Let the no. of books purchased be x
So, Total cost = xy
We are given that the total cost is 300
So, xy=300
Now a book is reduced by rupees 5 a person can buy 5 more books
So, the price of one book =y-5
The no. of books purchased =x+5
So, Total Cost = (x+5)(y-5)
Since we are given that the total cost is 300
So, (x+5)(y-5) =300
xy-5x+5y-25=300
300-5x+5y-25=300
-5x+5y=25
-x+y=5
{tex}-\frac{300}{y}+y=5{/tex}
{tex}-\frac{300+y^2}{y}=5{/tex}
{tex}y^2-5y-300=0{/tex}
{tex}y^2-20y+15y-300=0{/tex}
{tex}y(y-20)+15(y-20)=0{/tex}
(y-20)(y+15)=0
y=20,-15
Since Price cannot be negative
So, the original list price of the book is Rs.20
Posted by Sanya Singh 5 years, 11 months ago
- 3 answers
Yogita Ingle 5 years, 11 months ago
A variable X changes by A% and another variable Y changes by B%, then overall net change when the two variables are multiplied is given by :
A + B + AB/100
If the change is “increase” it is positive & if the change is “decrease” it is negative.
so for increasing 50% in side so
according to above concept
What will be increase in area of a circle if radius is increased by 50% ?
Ans : 50 + 50 + (50 x 50)/100 = 125%
Posted by Singh Jyoti 5 years, 11 months ago
- 1 answers
Yogita Ingle 5 years, 11 months ago
Given that circumference of circle = 154 m
i.e 2 π r = 154 ⇒ r = 154 / 2 π
⇒ r = 154 x 7 / 2 x 22.
⇒ r = 49 / 2 = 24.5 m
∴ radiu of circle = 24.5 m
Area of circle A = π r2
A = π x 49 / 2 x 49 / 2 = 3773 / 2 = 1886.5 m2 .
Posted by Virat Singh 5 years, 11 months ago
- 1 answers
Posted by Virat Singh 5 years, 11 months ago
- 0 answers
Posted by Hetvi Thakrar 5 years, 11 months ago
- 0 answers
Posted by Prem Lata 5 years, 11 months ago
- 0 answers
Posted by Abadh Patel 5 years, 11 months ago
- 0 answers
Posted by Abadh Patel 5 years, 11 months ago
- 0 answers
Posted by Rizwana Khan 5 years, 11 months ago
- 0 answers
Posted by Harshita Hegde 5 years, 11 months ago
- 1 answers
Home Stay 5 years, 11 months ago
Posted by Misha Ahuja 5 years, 11 months ago
- 2 answers
Posted by Anshu Pal 5 years, 11 months ago
- 2 answers
.. ... 5 years, 11 months ago
.. ... 5 years, 11 months ago
Posted by Himanshu Raj Bhoi 5 years, 11 months ago
- 0 answers
Posted by Ritesh Kumar 5 years, 11 months ago
- 1 answers
Posted by Vaishali Khatri 5 years, 11 months ago
- 0 answers
Posted by Mayuk Teotia 5 years, 11 months ago
- 3 answers
Posted by Gouri Singh Rajawat 5 years, 11 months ago
- 0 answers
Posted by Aabha Singh 5 years, 11 months ago
- 1 answers
.. ... 5 years, 11 months ago
Posted by Aabha Singh 5 years, 11 months ago
- 1 answers
.. ... 5 years, 11 months ago
Posted by Raheeba M D S 5 years, 11 months ago
- 1 answers
Posted by Virat Singh 5 years, 11 months ago
- 2 answers
Posted by Manav Singh Negi 5 years, 11 months ago
- 1 answers
Yogita Ingle 5 years, 11 months ago
a=2
d=2
Sn=210
n=?
Sn=n/2 × [2a+(n-1)d]
210=n/2×[4+(n-1)2]
210×2=n[4+(n-1)2]
420=4n+(n-1)2n
{tex}420=4n+2n^2-2n{/tex}
{tex}420=2(n^2-n){/tex}
{tex}210=n^2-n{/tex}
{tex}n^2-n-210=0{/tex}
{tex}n^2-15n+14n-210=0{/tex}
n(n-15)+14(n-15)=0
(n+14)(n-15)=0
n+14=0. n-15=0
n=-14. n=15
therefore n=15
=>15 terms are needed to get their sum as 210
myCBSEguide
Trusted by 1 Crore+ Students
Test Generator
Create papers online. It's FREE.
CUET Mock Tests
75,000+ questions to practice only on myCBSEguide app
Yogita Ingle 5 years, 11 months ago
Sides: side AB , Side BC and side AC
Angles : ∠A , ∠B, ∠C
1Thank You