Xiao gang jumped 85 times in the rope skipping competition, and the number of times he jumped was one second less than Xiao Hong. How many times did Xiao Hong jump If someone has a book on this topic, I hope he will write down the answers to the following four or five questions By 8:45

Xiao gang jumped 85 times in the rope skipping competition, and the number of times he jumped was one second less than Xiao Hong. How many times did Xiao Hong jump If someone has a book on this topic, I hope he will write down the answers to the following four or five questions By 8:45

Set to X
x*（1-1/2）=85
x=85*2
x=170
A: Xiao Hong jumped 170 times

This year, Xiaoqiang and Xiaogang are 22 years old. A year ago, Xiaogang was 4 years older than Xiaoqiang. How old are Xiaogang and Xiaoqiang this year?

Xiaogang is 13 years old and Xiaoqiang is 9 years old