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Mary's and bob's ages combined are twice Jane's age Mary is 8 years older than Bob Jane's age plus Bob's age is 20 years how old are they?
Wiki User
∙ 13y ago
(1) M+B=2*J
(2) M=8+B
(3) J+B=20
Three equations. Three unknowns.
Rewrite (1)
M=2*J-B
Sub into (2)
2*J-B=8+B
Solve for B
2B+8=2J or B+4=J
Sub J into (3)
2B + 4 = 20
B = 8
J = 12
M=16
Wiki User
∙ 13y ago
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