Question

(1)1/2 of 3/8 of a number is 21/5 of 20. What is the number?

(2)Three-fifths of the students in a school bring food from home while 140 do not. Find the number of students in the school.

(3) Adding double of a number to its fourth part gives 33/4 as the result. What is the number?

(4) Rahul has 75 marbles. In 10 rounds he lost 6 marbles each and in the next 5 rounds he gained 2 marbles each. How many marbles did Rahul have,
when the games ended?

(5)Simplity [-24-(-43)]+[25-{24 (-40)}]

(6)The length of a pole is 5.20m if 0.75 part of the pole is above the ground, what length of the pole is under the ground? ​

Answer 1

Answer:

1) 1/2 * 3/8 * x = 21/5*20

3/16 * x = 21*4

x = 21*4/16*3

x = 7/4

2) 3/5 * x = x-140

3x = 5x - 140

140 = 2x

x = 70

3) 2x + 1/4x = 33/4

8x+x/4 = 33/4

9x = 33

x= 11/3

4) 75-6*10 = 75-60 = 15

15 + 5*2 = 15 +10 = 25

5) -24-(-43)]+[25-{24 (-40)}

=> -24+43+25-24+40

=> 60

6) 5.20*0.75 = 3.9m

Hope it helps

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