Question

the mark portion is my question that how it comes step by step study the sum carefully and then ans me. pls answer me . here I write the sum again if u don't understand in the photo so pls check this=
1 by 5 +[ 1 by 21 ÷{1 by 4 - (1 by 5 - 1 by 30) } ]
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Answer 1

Answer:

81/105

Step-by-step explanation:

1/4 - 6-1/30 = 1/4 - 5/30

The lcm of 4 and 30 is 60 (30 x 2, 4 x 15)

∴ 15-10/30 = 5/60.

∴ 1/21/5/60 = 1/21 x 60/5 = 60/105 (lcm of 5 and 21 is 105)

∴ 1/5 + 60/105 = 21+60/105 = 81/105