Question

Pens cost $p exercise books cost $b. Write an algebraic expression that represent the cost of purchasing 20 pens and 8 exercise books.

Answer 1

20p+8b

Explanation:

pens=p

books=b there fore

20p+8b

Answer 2

Explanation:

Cost of one pen = $p

Cost of 20 pens = p*20 = 20p

Cost of an exercise book = $b

Cost of 8 exercise book = b*8 = 8b

Algebraic expression:

20p + 8b