Mrs. Monyei’s family is going on a road trip across Saudi. The car tank can fit 63 liters of gas. Every day the car uses 4 liters of gas. A light comes on when the remaining gas is 7 liters or less. Starting from a full tank, can Mrs. Monyei’s family drive the car for 12 days without the warning light coming on? Explain or show your reasoning. Starting from a full tank, can Mrs. Monyei's family drive the car for 18 days without the warning light coming on? Explain or show your reasoning. Write and solve an equation to determine the number of days Mrs Monyei can drive the car without the warning light coming on.