After interchanging + and x and two given numbers: which equation is true

1. A.
   $(3+5)\times 9=48$
2. B.
   $(9+2)\times 3=10$
3. C.
   $(3+7)\times 9=60$
4. D.
   $(9+1)\times 3=15$

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1. A.
   $(6+3)\times 10=36$
2. B.
   $(10+2)\times 6=20$
3. C.
   $(6+5)\times 10=50$
4. D.
   $(10+4)\times 6=30$

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1. A.
   $(15+2) \times 30=60$
2. B.
   $(30+3) \times 15=40$
3. C.
   $(15+4) \times 30=135$
4. D.
   $(30+1) \times 15=40$

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