HCF of fractions = (HCF of numerators) / (LCM of denominators)

Correct Option: C

We know that,
HCF of fractions = (HCF of numerators) / (LCM of denominators)
∴ Required HCF = (HCF of 4 and 7) / (LCM of 5 and 15)
=1/15

LCM of (12,18, 36) = 36
∴ A number greater than 300 on dividing by 36 leaves a remainder 4 = (36 x 9) + 4 = 328
Next numbe r = 328 + 36 = 364

Correct Option: B

LCM of (12,18, 36) = 36
∴ A number greater than 300 on dividing by 36 leaves a remainder 4 = (36 x 9) + 4 = 328
Next numbe r = 328 + 36 = 364
∴ Sum of number = 328 + 364 = 692

132 = 2 x 2 x 3 x 11
240 = 2 x 2 x 2 x 2 x 3 x 5
228 = 2 x 2 x 3 x 19

Correct Option: A

132 = 2 x 2 x 3 x 11
240 = 2 x 2 x 2 x 2 x 3 x 5
228 = 2 x 2 x 3 x 19

Hence, HCF of 132, 204 and 228 = 2 x 2 x 3 = 12

The HCF of [(480 - 390), (620 - 480), (620 - 390)]

Correct Option: B

The HCF of [(480 - 390), (620 - 480), (620 - 390)]
= HCF of 90, 140, 230 = 10

Required HCF = (HCF of numerators) / (LCM of denominators)

Correct Option: A

Required HCF = (HCF of numerators) / (LCM of denominators)
= (HCF of 1, 3 and 4) / (LCM of 2, 4, and 5)
= 1/20