- A65
- B50
- C60
- D55
Solution
Let the required number of hours be x Then,
less men,more hours(indirect proportional)
15:36::25:x
(15x){(36×25)
x=36×25/15=60
Solution
Let the required number of days be x
more students,less days(indirect proportional)
more pencils,more days(direct proportional)
students 15:5::9:x
pencils 18:66::9:x
(15×18×x)=(5×66×9)
x=5×66×9/15×18
x=11
Hence the required number of days is 11
Solution:
Let the required number of days be x
12 men=18 women
8 men =(18/12)×8 women=12 women
more women,less days (indirect proportional)
28:18::14:x
28x=18×14
x=18×14/28
x=9
Hence required number of days=9
solution
le the required cost be x paise
less weight,less cost (Direct proportional)
250:200::60:x
250×x=(200×60)
x=200×60/250
x=48
solution:
e tablespoon=1 tablespoon
3/2teaspoon=½table spoon
let the number of tablespoon required be x.
more people,more salt (direct proportional)
4:18::½:x
4x=18×½=9
x=9/4=2.25
le the dimensions of the shorter side be x
more is the longer side,more is the shorter side (direct proportion)
5/2:4::15/8:x
5/2x=4×15/8
x=15/2×2/5
x=3
Solution
total number of days=(30+31+30) =91 days
let the number of bananas be x.
more days,more bananas (direct proportional)
7:91::651:x
7x=91×651
x=91×651/7
x=8463
solution:
5 cm on the map represent 1450km.
1cm on the map represent (1450/5)km=290km
Hence the scale is 1cm :290km i.e;1:29×10⁶cm
Solution
let the required number of men be x.
more days ,less men(Indirect proportion)
20:16::30:x
20x=16×30
x=16×30/20
x=24
Solution
since each maid would work with one mop,so we shall consider 1 maid and q mop as 1 unit. Let the required time be x hours.
less maids and mops ,more time,less time (indirect proportion)
less floors,less time(direct proportion)
maida and mops 3:7::7:x
floors 7:3::7:x
3×7x=7×3×7
x=7×3×7/3×7
x=7