The LCM of two positive nos is 168 and their product is 504.
what is the difference in their squares?
A. 175 B.216 C.9 D.135
Answers were Sorted based on User's Feedback
Answer / aashima
Hi All,
The ans of this question 135.
504=2*2*2*3*3*7=8*3*3*7=24*21
168=2*2*2*3*7
it means 3 will come in both the numbers as 3 is coming
once in LCM but coming as 9 in product.
so possible numbers are 24 and 21.
so diff of products is 24*24-21*21=135
Is This Answer Correct ? | 64 Yes | 3 No |
Answer / prasun bose
let the numbers be a and b
so by question---ab=504 the product
and LCM= ab/common factor=168
so common factor=ab/168 =504/168 =3
factors of LCM 168=2,2,2,3,7
so taking 3 on both side,we have
2,2,2and3 is one nunber and the other is
3,and 7 . so the numbers are 24 and 21
now the difference of the square of these nunbers
is a2-b2=(a+b)(a-b)=(24+21)(24-21)=45(3)=135
thus the answer is D
Is This Answer Correct ? | 29 Yes | 1 No |
Answer / harsha
LCM * HCF=product of 2 numbers(a*b)
168*HCF=504
HCF will be 3.
therefore 504 is product of 2 numbers which are multiples of 3..
find out those 2 numbers which are multiples of 3 and their product is 504.
504=2*2*2*3*3*7.=(8*3)*(3*7)
504=24*21...i.e., a=24 ,b =21
difference between products=(24*24)-(21*21)=576-441=135.
Is This Answer Correct ? | 2 Yes | 0 No |
If m/n=6/5 then 3m+2n=?
A car is filled with 4.5 gallons of fuel for a round trip . Car is taken 1/4 more than in going than coming up. What is the fuel consumed in coming up ?
If the originally area is 17.83m2 and was increased to 20.36m2, what is the percentage increased?
Total distance is 120 km . Going by 60kmph and coming back by 40kmph what is the average speed?
tellme 2 mintes importance of media
sir, ihave cleared my ssc so(acctts) written exam i want to some tips for interveiw
solve the case : a man was found murdered on 02.10.1992 afternoon. 1. his wife colled poice 2. police questioned everyone. 3. wife : sir, i was sleeping, when d murder took place. 4.Cook: I was cooking. 5 Gardner : I was picking vegetables. 6 House-maid : i went to post office. 7 Children : we went to play. 8 Neighbour : We went to a marriage. Police arrested the murderer immediately. WHO IS IT ? REPLY WITH THE REASON IF U R BRILLIANT.
30 Answers Infosys, Wipro, GTE,
what is the exact qualifing marks for group 1 prelims
What should come in place of the question mark (?) in the following letter AC FH KM PR ? (a) VW (b) UX (c) UW (d) TV (e) None of these
A hollow cube of size 5 cm is taken, with a thickness of 1 cm. It is made of smaller cubes of size 1 cm. If 4 faces of the outer surface of the cube are painted, totally how many faces of the smaller cubes remain unpainted?
cost of an item is Rs 12.60 7 profit is 10% over selling price what is the selling price
From 7:00 AM to 11:00 AM it rained 2.25 inches. At 11:00 AM the rain increased to fall at a rate of 1.25 in. every two hours. How many inches of rain landed on the ground by 5:00 PM?