A path has n white tiles in a single row, completely surrounded by one ring of black tiles. Black tiles cost ₹15 each. Which expression gives the cost of the black tiles in rupees?

Question

Accepted Answer

15(2n + 6). The tiles fill 3 rows of (n + 2) tiles, and n of them are white, so black = 3(n + 2) − n = 2n + 6. Cost = 15(2n + 6). (2n + 2 forgets the 4 corner tiles.)

A path has n white tiles in a single row, completely surrounded by one ring of black tiles. Black tiles cost ₹15 each. Which expression gives the cost of the black tiles in rupees?

Step-by-Step Solution

Master this chapter in 30 minutes a day.

More Class 7 Formulas and Rules from Patterns practice