Maths Pair of Linear Equation in two variable part 13 (Examples Algebraic Elimination) CBSE class 10

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Maths Pair of Linear Equation in two variable part 13 (Examples Algebraic Elimination) CBSE class 10 Mathematics
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Please help! You told that at the last question that
50(x+2y)=50 x 40
Can you please explain to me how does 40 come?

JibranKhan