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.