4
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(7 - x/4) = 15 x/4 = 7 - 15 x/4 = -8 x = -32 Verification: 7 - ( -32/4) = 7 - (-8) = 7 + 8 = 15
The interval is, presumably, the range = 12.
4
2/4 out of 8 = 1/2 of 8 = 42/4 out of 8 = 1/2 of 8 = 42/4 out of 8 = 1/2 of 8 = 42/4 out of 8 = 1/2 of 8 = 4
Sum of 8 and 4 (8+4=12) is 12 Difference of 8 and 4 (8-4=4) is 4 So 12/4 is 3