Explain how knowing that 5/8 = 0.625 you write the decimal for 4 5/8

Can someone me and plz do the problem

Shannon mary and john earn a weekly allowance ahannon earns the amount that is 2/3 of what john earns mary earns an amount that is 1 2/3 of what johns earns 20 dollars a week who eaens the greatest allowance and who earns the least

Marking brainliest for original answer.. are these two triangles similar? how can you tell?