Math problem in the second volume of the fifth grade: the wide angle of mathematics

1. Four years ago, my father was 26 years older than Xiaoli: This year, my father is still 26 years older than Xiaoli.

So Xiaoli: (44-26)/2=9 years old Dad: 9+29=35 years old.

2. So 120+98- 135=83 people participated in two activities.

Therefore, people who only participate in sports:120-83 = 37; Only those who participate in literature and art: 98-83= 15.

3. One * * * has: 27+2 1-8=40 people (only for Youth Daily: 27-8= 19 people, only for Science Magazine: 2 1-8= 13 people, all: 65433.

4. Yin Yin is X, then Lily is 5X, and then

5X+3=(X+3)*2

x = 1.5x = 5

Yin Yin 1 year-old, Lily is 5 years old.

4*7=28

X=28-3-6-7- 1-3-6=2

So, 1, 2, 3, 3, 6, 6, 7.

So, the median is the fourth, the number is 3, and the modes are 3 and 6.