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90.0[(0.05/0.125-1/9+0.03\div 0.1/0.5+1/4)\div 1\ 8/15\div 1\ 8/15-1.5\div 3\ 3/4/0.25+3\ 1/4\div 13)-18\ 1/5]
SolveStep-By-Step 90(0.050.125−19+0.030.10.5+1418151815−1.53340.25+31413)−1815=90(0.4−19+0.030.10.5+1418151815−1.53340.25+31413)−1815=90(0.288889+0.030.10.5+1418151815−1.53340.25+31413)−1815=90(0.288889+0.30.5+1418151815−1.53340.25+31413)−1815=90(0.288889+0.6+1418151815−1.53340.25+31413)−1815=90(0.888889+1418151815−1.53340.25+31413)−1815=90(1.13888918151815−1.53340.25+31413)−1815=90(1.13888923151815−1.53340.25+31413)−1815=90(0.7427541815−1.53340.25+31413)−1815=90(0.7427542315−1.53340.25+31413)−1815=90(0.484405−1.53340.25+31413)−1815=90(0.484405−1.51540.25+31413)−1815=90(0.484405−250.25+31413)−1815=90(0.484405−1.6+31413)−1815=−96.103592
Hope I helped!

£126

Step-by-step explanation:

Ratio is 2:1 so the difference between the amount of money will be "1".  This is equal to £42 so 2 x 42 is 84 and 1 x 42 is 42, add them together and the answer is £126.