Question

Mr. Luca would like to purchase a digital
keyboard for each of his 3 nieces and
1 nephew. The keyboard costs $105.
A. Mr. Luca thinks the total cost should
be about $200. Is this amount
reasonable? Explain.
B. Write and solve an equation to find the total cost of the keyboards. Explain why your answer is reasonable.

Answer 1

A) No it is not reasonable because if you’re estimating the cost as
$100 (per keyboard) x 4 (that he needs to buy) = $400

4 x $105 = $420
Or
(3 + 1)$105 = $420