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Solve it first wid appropriate justification....

Q.1. What is the missing number in the pie below?

$\mathrm{In}\mathrm{the}\mathrm{pie}\mathrm{given}\mathrm{above},\phantom{\rule{0ex}{0ex}}10-4=6\mathrm{corresponds}\mathrm{to}17-11=6\phantom{\rule{0ex}{0ex}}\mathrm{Similarly}15-8=7\mathrm{corresponds}\mathrm{to}13-?=7\Rightarrow ?=13-7=6\phantom{\rule{0ex}{0ex}}\mathrm{So},?=6$

Regards

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