67.

By the property, MO * PQ = OQ * NP

We know what MO, PQ, and OQ are, so plug in those numbers

3 * 12 = 9 * NP

Solve for NP as if NP is x

36 = 9 * NP

NP = 36/9

NP = 4

68.

Again, by the property EF * FH = DF * FG

We know all of the numbers except for EF, which is what we are supposed to find (we know FH because we know FG and GH, and FG + GH = FH)

Plug the numbers in and solve for EF as if EF was an x

EF * 16 = 14 * 6

EF * 16 = 84

EF = 84/16

EF = 5.25

69.

In this problem, in order to find CE, we have to find AE and then subtract AC from AE to get the answer because AC + CE = AE

By the property, AC * AD = AE * AB

Plug in the numbers that we know

10 * 39 = AE * 15

Solve for AE

390 = AE * 15

AE = 390/15

AE = 26

Find CE

AE - AC = CE

26 - 10 = CE

CE = 16

70.

6/3 = 10/u

30 = 6u

u = 30/6

u = 5

71.

7/5 = t/3.5

24.5 = 5t

t = 24.5/5

t = 4.9

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