Deepak Suwalka
Deepak Suwalka answered

16 + (28/2) - (6 /10) - 4 × 2

Use order of operation, i.e., PEMDAS (Parenthesis, Exponent, Multiplication, Division, Addition, Subtraction)
First, simplify parenthesis
= 16 + 14 - 0.6 - 4 × 2
Now, multiplication
= 16 + 14 - 0.6 - 8
Similarly, apply addition and subtraction
= 30 - 0.6 - 8
= 21.4

Deepak Suwalka
Deepak Suwalka answered Anonymous' question

To obtain the desired 40% profit,
the book needs to sell for $50 + 40% * $50
Our target price for the sale is 50 + 0.4*50
= 50 + 20
=$70
We need the original price of the book
to be enough so that 20% off of that
price gives us $70

Set P = the original price
The original price minus 20% … Read more

Deepak Suwalka
Deepak Suwalka answered Allison Lee's question

let speed of wind be y mph
let speed of plane in still air be x
..
Against wind the speed = x-y
distance traveled = 2460
2460/x-y= 6
6x-6y= 2460
x-y=410...........1
..
with wind speed = x+y
distance is same 2460
2460/x+y=5

5x+5y=2460
x+y=492............2
..
Add equation 1 & 2
x-y+x+y=410+492
2x=902
x= 451 mph speed of plane in still air.
..
Plug the value of x in equation 1
451-y=410
y=451-410
y=40 mph the speed of
Read more

Deepak Suwalka
Deepak Suwalka answered

"Icosikaihenagon" is a proper denomination for a 21-sided polygon, according to Wikipedia (see Polygon).

However, I doubt that even a well-read mathematician would understand precisely what this word is referring to (apart perhaps if the said mathematician is Greek).

"21-gon" would be a much more intelligible designation.


Deepak Suwalka
Deepak Suwalka answered

Harry now  = x
Nick now =7x

Nick in 6 years = 7x+6
Harry in 6 years = x+6

Nick in 6 years = 5(Harry in 6 years)

7x+6 = 5(x+6)

So that's the one we want:  7x+6 = 5(x+6)

7x+6 = 5x+30

2x = 24

x =12

so Harry's age in 6 years will be … Read more