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Sixth grade thinking training questions
Consider the total amount of money for four people.

It is known that A's money is half that of the other three, so A's money is one third of the total.

Similarly, B's money is a quarter of the total and C's money is a fifth of the total, so D's money is1-1/3-1/4-1/5 =13/60 of the total.

The total amount of money is 9 10 divided by 13/60=4200 (yuan).

A x,b y,c z

x=0.5*(9 10+y+z)

y=(x+z+9 10)/3

Z=(x+y+9 10)/4

x= 1400

y= 1050

z=840

x+y+z+9 10=4200