Question

Find the least number which on decreasing by 20 is exactly divisible by 18 21 28 and 30​

Answer 1

Answer:

LET

Step-by-step explanation:

LET THE NUMBER BE x

SO,

A.T.Q.,

(x-20) IS EXACTLY  DIVISIBLE BY 18,21,28,30

SO,

LCM OF 18,21,28,30 = 1260

SO,

(1260*1)-20 = 1240 WHICH IS NOT DIVISBLE BY 18,21,28,30

(1260*2)-20=2520  WHICH IS NOT DIVISBLE BY 18,21,28,30

(1260*3)-20=3780  WHICH IS NOT DIVISBLE BY 18,21,28,30

(1260*4)-20=5040  WHICH IS NOT DIVISBLE BY 18,21,28,30

(1260*5)-20=

I HOPE YOU UNDERSTOOD THE QUESTION