Let x be the number of Php 5-coins. Then the number of Php 1-coins is (2x+1), according to the condition. The total money equation is 5x + 1*(2x+1) = 57. Simplify and solve for x. ANSWER. 8 Php 5-coins and (2*8+1) = 17 Php 1-coins. CHECK. 8*5 + 17*1 = 40 + 17 = 57 Php. ! Correct !