Math, asked by kirtika11416379, 8 months ago

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Answered by amoghnasa
1

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%

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