18. Vishesh spent 2/5 of his pocket money during the lunch break an of it after school. He also spent 1/6 of his pocket money for his younger brother what part of the money did he spend in all
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let the money spend by vihesh be x
let the money for younger brother be y
1. 2/5x+y =0
2.x+1/6y =0
now multiply 2 eq with 2/5
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