15. Robin is Sachin’s younger brother and Savita is his elder sister. Robin is 4 years younger than Sachin and
Savita is 3 years elder than Sachin. Sachin’s grandfather is 6 time Sachin’s age. Sachin’s father is 6 years more
than 3 times Robin’s age. Grandmother is 5 years younger than grandfather. Take Sachin’s age z years and
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