Let (17.28 ÷ N ) / (3.6 x 0.2) = 2
Then, 17.28 / N = 1.44
? N = 17.28 / 1.44
= 12
Given expression = 1/2 + 1/2 ÷ 1/2
= 1/2 + 1
= 3 / 2
Given expression = 3/2 x 4/3 + 1/4
= 2 + 1/4
= 9/4
Given expression = 1 + 1 ÷ {1 + 1 ÷ (1 + 1/3)}
= 1 + 1 ÷ { 1 + 1 ÷ 4/3}
= 1 + 1 ÷ { 1 + 3/4}
= 1 + 1 ÷ 7/4
= 1 + 1 x 4/7
= 1 + 4/7
= 14/7
Given expression = 10 - [ 9 - {8 - 1}] - 5
= 10 - [9 - 7] - 5
= 10 - 2 - 5
= 3
Given expression = 48/12 x (3/2 ÷ 1/2)
= 4 x (3/2) x 2
= 12
Given expression = [(69842)2 - (30158)2] / [(69842 - 30158)]
= [ (69842 - 30158) (69842 + 30158) ] / (60842 - 30158)
= 100000
Given expression = 93/100 + 7/5 x 1/20
= 93/100 + 7/100
= 1
Given expression = (108 + 9 + 3 +1) / 108
= 121 / 108
= 1.1203
Given expression = (1/5 ÷ 1/25 ) / (1/25 ÷ 1/5)
= (1/5 x 25) / (1/25 x 5)
= 5 x 5
= 25
Given expression = (1/4 + 1/4 x 4/5) / (1/16 + 9/4)
= (1/4 + 1/5) / (37/16)
= 9/20 x 16/37
= 36/185
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