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CBSE Class 10 Answered

A boys works x+y sums, of which only y- 2z are right; how many are wrong?
Asked by guduguntlammulu28102004 | 15 Aug, 2020, 05:09: PM
Expert Answer
Total Sums = x+y 
Correct sums = y - 2z are right;
Sums that are wrong = total - correct ones
= x + y - (y - 2z)
= x + y - y + 2z
= x + 2z

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