Question

Find the lcm between green lights

Answer 1

Answer:

traffic signals in such a way that all lights are not green at the same time,

especially not in rush hours. To maintain the smooth flow of traffic, the timings

of nearby places in the same area are taken to calculate the traffic stops. The

duration of traffic signal can be increased or decreased at different times. There

are two traffic lights on a particular highway which show green light at a duration

of 90 seconds and 144 seconds, respectively.

) Find the HCF between two green lights.

(a) 20 (b) 18

( c) 16 (d) 22

(ii) Find the LCM between two green lights.

(a) 720 (b) 730

(c ) 540 (d) 640

(iii) Factor tree is used for determining the

(a) HCF (b) LCM

(c)Prime factors (d) None of these

(iv) Identify the correct option.

(a) HCF (a, b) × LCM (a , b) =

(b) ( ,)

( ,)

=

(c) HCF (a, b) × LCM (a , b) = a - b

(d)HCF (a , b) × LCM(a , b) = ab

(v) Numbers that do not have no common factors other than 1, are called

(a) Coprime numbers

(b)Prime numbers

(c) Both prime and coprime numbers

(d)Composite numbers​