Let L stand for the larger and S stand for the smaller.
From the second sentence, you know that L = S + 20.
From the second sentence, you know
4L = 5S + 70
Substitute S + 20 for L in the second equation. Solve for S. Put value of S in the first equation to solve for L. Check answers by putting both values in the second equation.
I hope this helps. Thanks for asking.
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