Chuck must save a total of $180 for a new bike. so far, he has saved 4/5 of the amount. how much money has chuck saved for his new bike?
a.$36
b.$120
c.$144
d.$225

What is the value of x? enter your answer in the box. photo attached.

How to solve a simultaneous equation involved with fractions?

9.4.34  question   to estimate the height of a stone  figure, an observer holds a small square up to her eyes and walks backward from the figure. she stops when the bottom of the figure aligns with the bottom edge of the  square, and when the top of the figure aligns with the top edge of the square. her eye level is 1.811.81 m from the ground. she is 3.703.70 m from the figure. what is the height of the figure to the nearest hundredth of a  meter?