Question

math

chapter name :- the unitary method and variation

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Question:- 1 to 5​

Answer 1

Step-by-step explanation:

2) (i)

30 pens costs rs.750

x pen costs rs.1000

30 750

----- = -------

x 1000

cross multiplying we get,

30 × 1000 = 750 × x

30000 = 750x

30000

X = ---------

750

X = 40

hence 40 pens costs rs.1000

Answer 2

HELLO...

ATS HERE....

1. (i) 7kg costs =₹140

1 kg = 140/7

1kg = ₹ 20

10kg = 10 × ₹20

10kg = ₹ 200

so 10 kg of sugar costs 200 rupees

(ii) 14 m costs ₹ 3864

1m = 3864 / 14

1m = 1932/7

1m = 276 rupees

costs of 24 m cloth = 24 × 276

24m costs = 6624 rupees

2. (i) 30 pens costs 750

1 pen = 750 / 30

1 pen = 25

let the number of pens costs 1000 be x

x × 25 = 1000

x = 1000 / 25

x = 40

so 40 pens will cost 1000 rupees

(ii) 6 copies costs 21

1 copy = 21 /6

let the copies costs ₹ 70 be x

21 / 6 × X = 70

21 × X = 70 ×6

X = 420 / 21

X = 20

20 copies will costs 70 rupees

3.(i)40 rupees for 2 shirts

1 shirt = 40 /2

1 shirt = 20

for 11 shirts

11 shirts = 11 × 20

11 shirts will costs 220 rupees

(ii)3500 rupees for 10days

1 day = 3500/10

1 day = 350

cost for 7 days

7 days =7 × 350

7 days costs 2450 rupees

4. 20 seconds in 4 days

1 day =20 / 4

1 day = 5 second

7 days = 7 × 5

35 seconds

5. 15 L covers 270 km

1L = 270/15

1L = 18 km

(i) let the letres be x

18 ×X = 180

x = 180/18

x = 10 Letres ...

(ii) let the letres be x

18 × x = 360

x = 360/18

x = 20

now the expenditure

1 L costs ₹42

20 L = 42 × 20

20 L costs = 840 rupees....

HERE IS YOUR ANSWER.....