How Can You Tell About Heart Disease?
They say that blood pressure of 120 over 80 is normal.
But I haven’t found anything that tells about the ratio between the two. For instance if you read 117 (higher figure) and 64 (the lower figure), is it still normal to have such a big difference?

Most normal blood pressures fall in the range of 90/60 millimeters of mercury (mm Hg) to 130/80 mm Hg. But a significant drop, even as little as 20 mm Hg, can cause problems for some people.
Systolic blood pressure-117 mmHg- Normal.
Diastolic blood pressure- 64 mmHg- Normal.
Your pulse pressure is 53 mmHg.
That’s not a big difference; considered normal.