# Recent questions tagged lcm-hcf

1
The $L.C.M$ of $\left (x^{3}-x^{2}-2x \right)$ and $\left (x^{3}+x^{2} \right)$ is : $\left (x^{3}-x^{2}-2x \right)$ $\left (x^{2}+x \right)$ $\left (x^{4}-x^{3}-2x^{2} \right)$ $x-2$
2
About the number of pairs which have $16$ as their H.C.F. and $136$ as their L.C.M., we can definitely say that: Only one such pair exists Only two such pairs exist Many such pairs exist No such pair exists
3
The H.C.F. of $(4x^{3}+3x^{2}y-9xy^{2}+2y^{3})$ and $(x^{2}+xy-2y^{2})$ is : $(x-2y)$ $(x-y)$ $(x+2y)(x-y)$ $(x-2y)(x-y)$
4
The $LCM$ of two numbers is $45$ times their $HCF$. If the sum of the $LCM$ and the $HCF$ of these two numbers is $1150$ and one of the numbers is $125$, then the other number is : $256$ $225$ $250$ $255$
5
Let $N$ be the greatest number that will divide $1305, 4665$ and $6905$, leaving the same remainder in each case. Then sum of the digits in $N$ is $4$ $5$ $6$ $8$
6
Outside a sweet shop, its name "Madhu Sweet House" is displayed using blinking lights. Each word flashes at a regular interval and remains lit for $1$ second. After remaining lit for $1$ second, "Madhu" remains unlit for $3 \dfrac{1}{2}$ seconds, "Sweet" remains ... words flash together and the next time the last two words flash together $45$ seconds $22.5$ seconds $112$ seconds $6.75$ seconds
1 vote
7
Which of the following represents the largest 4 digit number which can be added to 7249 in order to make the derived number divisible by each of 12, 14, 21, 33, and 54. (a) 9123 (b) 9383 (c) 8727 (d) None of these
1 vote
8
Find the minimum number of square tiles required to pave the floor of a room of 3m 25cm long and 2m 50cm broad? 144 130 156 168
9
1 vote
10
Three bells chime at an interval of 18, 24 and 32 minutes respectively. At a certain time they begin to chime together. What length of time will elapse before they chime together again? 2 hours 24 minutes 4 hours 48 minutes 1 hour 36 minutes 5 hours
1 vote
11
i tried to solve this question but ans did.come .so how can be sove this question
A red light flashes $3$ times per minute and a green light flashes $5$ times in two minutes at regular intervals. If both lights start flashing at the same time, how many times do they flash together in each hour? $30$ $24$ $20$ $60$
In a book store, each of the word of the glowsign board “MODERN BOOK STORES” is visible after $5/2, 17/4$ and $41/8$ seconds respectively. Each of them is put off for $1$ second. Find the time after which one person can see a completely visible glowsign board. $73.5$ seconds $79.4$ seconds $68.2$ seconds None of these