Question

10 x { 24 - [ 20 - (5 x a - 3)] : 2 } = 150
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Answer 1

10 × { 24 - [ 20 - ( 5 × a - 3 ) ] : 2 } = 150

{ 24 - [ 20 - ( 5 × a - 3 ) ] : 2 } = 150 : 10

{ 24 - [ 20 - ( 5 × a - 3 ) ] : 2 } = 15

{ [ 20 - ( 5 × a - 3 ) ] : 2 } = 24 - 15

{ [ 20 - ( 5 × a - 3 ) ] : 2 } = 9

[ ( 5 × a - 3 ) : 2 ] = 20 - 9

[ ( 5 × a - 3 ) : 2 ] = 11

5 × a - 3 = 11 × 2

5 × a - 3 = 22

5 × a = 22 + 3

5 × a = 25

a = 25 : 5

a = 5