Chen receives £20 - £4 he spends on fuel is £16 The equation is 16 x how many gardens
2 gardens mowed would be £32 4 would be £64 6 would be £96 8 would be £128 10 would be £160 12 would be £192 14 would be £224 16 would be £256 18 would be £288 20 would be £320