A 95 wt% Pt-5 wt% Ni alloy is known to have an electrical resistivity of 2.35 × 10-7 Ω-m at room temperature (25°C). Calculate the composition of a platinum-nickel alloy that gives a room-temperature resistivity of 1.75 × 10-7 Ω-m. The room-temperature resistivity of pure platinum may be determined from the data in Table 18.1; assume that platinum and nickel form a solid solution.