Question

How much does seven light bulbs cost if five light bulbs cost nine dollars

Answer 1

Cost of 5 bulbs = $9

》Cost of 1 bulb=9/5=$1.8dollars.

Now, cost of 7 bulbs = 7×1.8

._________________________

|》Cost of 7 bulbs =$12.6dollars

|._________________________

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Answer 2

Cost of 5 bulbs = $9

》Cost of 1 bulb=9/5=$1.8dollars.

Now, cost of 7 bulbs = 7×1.8

._________________________

|》Cost of 7 bulbs =$12.6dollars

|._________________________