Question

25c + 48a when c = 12 and a = 4.

( I think the answer is 492 but I'm not sure. Please correct me if I'm wrong. )

Answer 1

Your answer is 492
48 x 4 =192
Multiply 25 x 12
And add you get 492

Answer 2

492

Explanation:

You want the value of (25c+48a) when c=12 and a=4.

Evaluation

Put the numbers in place of the corresponding variable and do the arithmetic. A calculator can help you out, if needed.

25c +48a = 25·12 +48·4 = 300 +192 = 492

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Additional comment

There are some mental math tricks that can help you do this in your head:

25 = 100/4, so 25·12 = (100/4)·12 = 100·(12/4) = 100·3 = 300

4 = 2·2, so 48·4 = (48·2)·2 = 96·2 = 192

Doubling or halving a number is generally pretty easy, so multiplication or division by 2, 4, or 8 can be accomplished by repeatedly multiplying or dividing by 2.