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Answers
Step-by-step explanation:
Q1)
a) 4 rupees to 2 rupees 40 paise
= 4 rupees = 400 paise
2 rupees 40 paise = 240 paise
thus 400:240 = 5:3
b)1.2m to 250 cm
1.2m =120 cm
120:250 = 12:25
c) 25 cm to 1.5m
1.5m = 150 cm
25:150 = 1:6
d) 3 kg to 750 g
3kg = 3000gm
3000:750 = 4:1
Q2)
5:9
multiply by 2 on both sides,
10:18.
thus, 5:9 is in proportion to 10:18
Q3)
12.5%. of 1 hour 40 min
1 hr 40 min = 100 min
taking percentage ,
100*125/100 = 125 min
thu, 125 min = 2 hours 05 minutes
Q4)
speed = 25km/hr
time = 2.5 hr
so , distance = speed * time
distance = 25*2.5
distance = 62.5 km
Q5)
Divide 180 in the ratio 4:5
numbers with 4:5 ratio, their sum 180
4x + 5x = 180
9x = 180
x = 20
so, 4x = 80 and 5x = 100
the numbers are , 80 and 100
Q6)
express 1.25 as percentage
multiply numerator and denominator by 100,
1.25*100/100 = 125/100
or 5/4 which is 125%