Advertisements
Advertisements
Question
The ratio between two numbers is 3: 4. If their L.C.M., is 180. Find the numbers.
Advertisements
Solution
Let the required numbers be 3x and 4x.
The L.C.M., of 3x and 4x = 12x
Then 12x = 180
⇒ x = 15
HEnce, the required numbers are
3x = 3 x 15 = 45
4x = 4 x 15 = 60.
APPEARS IN
RELATED QUESTIONS
If (a – b) : (a + b) = 1 : 11, find the ratio (5a + 4b + 15) : (5a – 4b + 3).
Divide Rs 1,290 into A, B and C such that A is `2/5` of B and B : C = 4 : 3.
Express the given ratio in its simplest form: 200 m : 5 km
Two numbers are in the ratio 4 : 7. If their L.C.M. is 168, find the numbers.
Find the sub-triplicate ratio of 1 : 216
Ratio of 5 km 400 m to 6 km = _______________
The ratio of 1 l to 50 ml is ______________
`3/8 = 15/40`
In a college, out of 4320 students, 2300 are girls. Find the ratio of number of girls to the total number of students.
A doctor reports blood pressure in millimeters of mercury (mm Hg) as a ratio of systolic blood pressure to diastolic blood pressure (such as 140 over 80). Systolic pressure is measured when the heart beats, and diastolic pressure is measured when it rests. Refer to the table of blood pressure ranges for adults.
| Blood Pressure Ranges | |||
| Normal | Prehypertension | Hypertension (Very High) |
|
| Systolic | Under 120 mm Hg | 120-139 mm Hg | 140 mm Hg and above |
| Diastolic | Under 80 mm Hg | 80-89 mm Hg | 90 mm Hg and above |
Manohar is a healthy 37 years old man whose blood pressure is in the normal category.
- Calculate an approximate ratio of systolic to diastolic blood pressures in the normal range.
- If Manohar’s systolic blood pressure is 102 mm Hg, use the ratio from part (a) to predict his diastolic blood pressure.
- Calculate the ratio of average systolic to average diastolic blood pressure in the prehypertension category.
