an advertising agency find that of the 170 clients, 115 used television,110 use radio and 130 use magazine, also 85 use television

an advertising agency find that of the 170 clients, 115 used television,110 use radio and 130 use magazine, also 85 use television and magazine, 75 use television and radio, 95 use radio and magazine, 79 uses sale the three. find how many used only radio​