Solution:
Because, \[\Delta \text{ }LQM\text{ }and\text{ }\Delta \text{ }LQN\] have common vertex at \[L\]and their bases \[QM\text{ }and\text{ }QN\] are along the same straight line.
\[Area\text{ }of\text{ }\Delta \text{ }LQM/\text{ }Area\text{ }of\text{ }\Delta \text{ }LQN\]
\[=\text{ }QM/QN\text{ }=\text{ }10/7\]
\[[Since,\text{ }MN/QN\text{ }=\text{ }3/7\Rightarrow QM/QN\text{ }=\text{ }10/7]\]