Question

I have a doubt in this can u say the answer ​

Answer 1

Answer: 18. 27

19. 16m

20. 63%

Step-by-step explanation: 18. We need to find the prime factors of 432 and 1053.

432 = 2*2*2*2*3*3*3

1053 = 3*3*3*3*13

HCF = 3*3*3 = 27

Therefore, the greatest number that exactly divides 432 and 1053 is 27.

19. According to the question,

at the same time, the two trees cast their shadow.

So, they should have equal ratios of their actual height to the height of their shadows.

Now,

let the height of the first tree be x m.

Then,

x:10 = 12:7.5

=> x = (12*10)/7.5

=> x = 120/7.5

=> x = 16

Therefore, the height of the first tree is 16 m.

20. Total marks = 300

Marks of the student = 189

Percentage of the student = [(189/300) * 100]% = 63%

Therefore, his score in percentage is 63%.

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