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sesenic [268]
3 years ago
10

SOMEONE HELP PLEASE! A lot of points!

Mathematics
1 answer:
Alik [6]3 years ago
4 0

Answer:

First, you have to form simultaneous equation for both of their ages in yerms of a and b :

b = 4a - 12 -------- ( 1 )

a + b = 28 -------- ( 2 )

Next, you will have to solve it by substituting ( 1 ) into ( 2 ) :

a + (4a - 12) = 28

5a - 12 = 28

5a = 28 + 12

5a = 40

a = 8

Then, substitute a = 8 into ( 1 ) :

b = 4(8) - 12

b = 32 - 12

b = 20

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