plz solve happy

[mnvsriram]

7) The sum of two numbers is 216 and their
H.C.F. is 27. The numbers are:


(a) 27, 189


(b) 81, 189


(c) 108, 108


(d) 154, 162




















4. A car owner buys petrol at Rs 7.50, Rs. 8
-and Rs. 8.50 per litre for three successive years. What approximately is the
average cost per litre of petrol if he spends Rs. 4000 each year?





(a) Rs. 7.98


(b) Rs. 8


(c) Rs. 8.50


(d) Rs. 9 –
















2) Can you find a number which added to itself one
or several times will give a total having the same digits as that number but
differently arranged and after the sixth addition will give a total of all
nines?

[keerthi]

Hi sriram,


The questions are already solved in daily contests section.


Please have a look at them and trry to solve them.


Bye


Keerthi

[sowmya571]

HELLO



these are already solved ya jus check it again in the list u will find out



bye



sowmya

[keerthi]

7) The sum of two numbers is 216 and their H.C.F. is 27. The numbers are:
(a) 27, 189
(b) 81, 189
(c) 108, 108
(d) 154, 162
Ans)A
AS 27 is the highest common factor of the two no's
let the no's be =27x and 27y
now 27x+27y=216
=> x+y=8
x=1 and y= 7 safisfies the above equation.
hence answer is 27 and 189

4. A car owner buys petrol at Rs 7.50, Rs. 8 -and Rs. 8.50 per litre for three successive years. What approximately is the average cost per litre of petrol if he spends Rs. 4000 each year?

(a) Rs. 7.98
(b) Rs. 8
(c) Rs. 8.50
(d) Rs. 9 –

Avg cost=Total amount/Total Quantity of petrol
Total quantity=4000(1/7.50+1/8+1/8.50)ltrs
=1503. 9
Total amount=3*4000=Rs.12000
So the Avg cost=12000/1503.9=Rs7.98

[sowmya571]

hello

Posted: 13 February 2006 at 8:39pm | IP Logged	[img]forum_images/quote_icon.gif[/img]

7) The sum of two numbers is 216 and their H.C.F. is 27. The numbers are:
(a) 27, 189
(b) 81, 189
(c) 108, 108
(d) 154, 162

by solving equation we get a=1 and b =7 Ans a





Edited by: keerthi

[sowmya571]

hello



the next one explanation is given by keerthi right ..follow her she is correct



bye



sowmya