The H.C.F and L.C.M of two numbers are 7 and 140 respectively. If these numbers are between 20 and 45 then sum of these number is :
Answer & explanation
Correct answer: option 3
Let two no. are =7a and 7b
⇒ LCM × HCF = Product of two no.
⇒ 7 × 140 = 7a × 7b ⇒ ab = 20
Req. no. are = 7 × 4, 7 × 5 = 28, 35
⸫ Sum = 28 + 35 = 63