elsa is twice as old as anna. seven years ago, the sum of their ages was 16 how old is anna now?
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Step-by-step explanation:
Let present ages of marina be 'm' and daughter be 'd'
Four years ago means m-4 and d-4. According to the first statement
m-4 = 3*(d-4). Solving this
m -3d +8 = 0 --- (1)
Six years from now means
m +6 and d+6. According to second statement
m + 6 = 2*(d+6). Solving this
m -2d -6 = 0 ----(2)
Just solve eq. 1 and 2 to get the 'm' and 'd' which will be the present age.
This looks like a homework problem. So please try it. If you can't solve it then comment and will try to help out.
Solve using simultaneous equation method
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