Siblings 48821

Three siblings saved CZK 1,445. Adela saved 10% less than Martin and David 10% more than Adela. How many crowns did each of them save?

Correct answer:

D =  495 Kc
A =  450 Kc
M =  500 Kc

Step-by-step explanation:

a=100%10%=110010=0.9 d=100%+10%=1+10010=1.1  A+M+D=1445 A=a M D=d A A+M+D=1445 A=0.9 M D=1.1 A  A+D+M=1445 A0.9M=0 1.1AD=0  Pivot:Row1Row3 1.1AD=0 A0.9M=0 A+D+M=1445  Row21.11 Row1Row2 1.1AD=0 0.909D0.9M=0 A+D+M=1445  Row31.11 Row1Row3 1.1AD=0 0.909D0.9M=0 1.909D+M=1445  Pivot:Row2Row3 1.1AD=0 1.909D+M=1445 0.909D0.9M=0  Row31.909090910.90909091 Row2Row3 1.1AD=0 1.909D+M=1445 1.376M=688.095  M=1.37619048688.0952381=500 D=1.909090911445M=1.909090911445500=495 A=1.10+D=1.10+495=450  A=450 D=495 M=500

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