Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
Andy harvests all the tomatoes from 18 plants that have 7 tomatoes each. If he dries half the tomatoes and turns a third of the remainder into marinara sauce, how many tomatoes are left?

### Response:
 Kwanza tafuta idadi ya jumla ya nyanya zilizovunwa: mimea 18 * nyanya 7/kila mmea = <<18*7=126>>126 nyanya
Kisha gawanya idadi hiyo kwa 2 ili kupata nyanya zilizobaki bila kukaushwa: 126 nyanya / 2 = <<126/2=63>>63 nyanya
Kisha gawanya idadi hiyo kwa 3 ili kupata nyanya zilizogeuzwa kuwa mchuzi: 63 nyanya / 3 = <<63/3=21>>21 nyanya
Kisha toa idadi hiyo kutoka kwenye idadi ya nyanya zilizobaki bila kukaushwa ili kupata idadi ya jumla ya nyanya zilizobaki: 63 nyanya - 21 nyanya = <<63-21=42>>42 nyanya