Question

f5 * 4 = 41 and 6 * 3 = 45, what is 7 * 2?

• A. 48
• B. 51
• C. 53
• D. 55

Answer 1

Answer:

C. 53

A simple rule that fits both examples is:

$a * b = (a \times b) + 21$

Check:

• $(5 * 4 = (5 \times 4) + 21 = 20 + 21 = 41)$

• $(6 * 3 = (6 \times 3) + 21 = 18 + 21 = 39), which <b>does not</b> equal 45$

So that rule doesn't work.

Another rule:

$a * b = a^2 + b^2$

• $(5 * 4 = 25 + 16 = 41)$

• $(6 * 3 = 36 + 9 = 45)$

Therefore,

$7 * 2 = 49 + 4 = \boxed{53}$

$Answer: (\boxed{53})$