Q is a point on segment PR. If PQ = 2.7 and PR = 6.1, what is QR?

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Q is a point on segment PR. If PQ = 2.7 and PR = 6.1, what is QR?

From segment addition, we know that:
PQ + QR = PR

Plugging our given numbers in, we get:
2.7 + QR = 6.1

Subtract 2.7 from each side, and we get:
2.7 - 2.7 + QR = 6.1 - 2.7

Cancelling the 2.7 on the left side, we get:
QR = 3.4