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andrealfar1010
23.10.2019 •
Mathematics
Express the following as a single discount rate.
1. 25% and 16%
2. 30%, 20%, and 5%
3. 60%, 10%, and 5%
4. 40%, 20%, 121⁄2%, and 4%
5. 25%, 20%, and 3%
6. 331⁄3%, 25%, and 5%
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Ответ:
ans is b...multiply first eqn by -2
=》 -6x -4y = -48...eqn 3
add eqn 2 and 3...
=》 -2y = -18
=》 y = 9...x =2