Question

On a sunny day, if a 36-inch yardstick casts a 21-inch shadow, how tall is a tree whose shadow is 168 in.?

Answer 1

Answer:

${57 \times x { - \sqrt{ + } }^{2} }^{?}$

$\frac{5xy \div ( + \frac{ \frac{?}{?} }{?} }{?}$