Current location - Training Enrollment Network - Mathematics courses - Find the answers to several math problems (under the seventh grade in the new summer vacation)
Find the answers to several math problems (under the seventh grade in the new summer vacation)
1. Let the height of A be x cm and the height of B be y cm, so:

x+y=55 ①

2/3x=4/5y ②

The solution is: x=30 y=25.

The water depth in the bucket is 20 cm.

2. Let 1988 be a, a+ 1, a+2, a+3 and a+4 respectively.

The total age is 5A+ 10. 22 years after 20 10, the age sum is 5a+10+22× 5 = 5a+120.

The formula is 5A+ 120=3(5A+ 10).

The solution is A=9.

So it's 9.10.1.12.13.