Answer:
24 years.
B is correct option.
Step-by-step explanation:
Let Sunita's current age is x and that of Mark's is y.
Hence, we have
\(\frac{x}{y}=\frac{3}{4}\\\\x=\frac{3}{4}y.......(1)\)
Now, in 12 years the ratio will be 5 to 6. Thus, we have
\(\frac{x+12}{y+12}=\frac{5}{6}\)
Cross multiplying, we get
\(6x+72=5y+60\)
Plunging, the value of x from equation (1)
\(6(\frac{3}{4}y)+72=5y+60\\\\\frac{9y}{2}+72=5y+60\\\\\frac{y}{2}=12\\\\y=24\)
Therefore, Mark's current age is 24 years.
