Question 1073130
Shabbir: S
Mother : M
M is now 48
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M-13 = 7(S-13)
48-13 = 7S-91
35 = 7S-91 flip the equation so we have the variable S on the left
7S-91 = 35
7S = 126
S = 18 So, Shabbir is presently 18 
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Check:
M-13 = 7(S-13)
48-13 = 7(18-13) 
35 = 35 Correct.