Charlie's gas tank is 1/4 full. After he buys 10 gallons of gas, it is 2/3
full. How many gallons can Charlie's tank hold?

Areflection of shape i across the y-axis, followed by a , and then a translation left 6 units and down 4 units confirms congruence between shape i and shape ii. alternatively, a of shape ii about the origin, followed by a reflection across the y-axis, and then a translation right 4 units and up 6 units confirms congruence between shape ii and shape i.