The sum of the ages of Musa and Lawal is 28 years. After sharing a certain sum of money in the ratio of their ages, Musa gets N600 and Lawal N800. How old is Lawal?

A.
14 years 
B.
20 years 
C.
12 years 
D.
16 years
Correct Answer: Option D
Explanation
M + L = 28,
M : L = 600 : 800
= 3 : 4
(frac{M}{L}) = (frac{3}{4}) (to) M = (frac{3}{4})L
(frac{3}{4})L + L = 28
(frac{7L}{4}) = 28
L = (frac{4 times 28}{7})
= 16