Question

After interchanging + & x and 3 & 9, which of the following equations will hold true?

• A. (3+5)×9=48
• B. (9+2)x3=10
• C. (3+7)×9=60
• D. (9+1)x3=15

Answer 1

Answer:

A. (3+5)×9=48

Interchange:

• (+) and (\times)

• (3) and (9)

Check each option after interchange.

---

1. ((3+5)\times9=48)

After interchange:

$(9 \times 5)+3$
$45+3=48$

True

---

2. ((9+2)\times3=10)

After interchange:

$(3 \times 2)+9$
$6+9=15 \neq 10$

False

---

3. $((3+7)\times9=60)$

After interchange:

$(9 \times 7)+3$
$63+3=66 \neq 60$

False

---

4. ((9+1)\times3=15)

After interchange:

$(3 \times 1)+9$
$3+9=12 \neq 15$

False

Therefore, the correct equation is:

$\boxed{(3+5)\times9=48}$