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

### Instruction:
Billy is counting the rings in two trees. Weather fluctuations in this area mean that each tree's rings are in groups of two fat rings and four thin rings. If Billy counts 70 ring groups in the first tree and 40 ring groups in the second tree, how much older is the first tree? (Trees grow 1 ring per year.)

### Response:
 Kwanza tafuta idadi ya jumla ya pete katika kundi moja la pete: pete 2 + pete 4 = <<2+4=6>>6 pete
Kisha toa idadi ya makundi ya pete kwenye mti wa pili kutoka kwenye mti wa kwanza ili kupata tofauti: makundi 70 - makundi 40 = <<70-40=30>>30 makundi
Kisha pombe idadi hiyo kwa idadi ya pete katika kundi ili kupata tofauti katika umri wa miti: makundi 30 * pete 6/kundi = 180 pete, au miaka 180