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Numbers

78. 15:120 :...

Question

78. 15:120 :: 20 : 210 ::43:946 :: 35 :? (1) 630(2) 625(3) 636(4) 624

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Q. Factorize:
30x² + 7x − 15

1 by \frac{1}{2}

5 by \frac{- 5}{7}

\frac{- 3}{4} by \frac{9}{- 16}

\frac{- 7}{8} by \frac{- 21}{16}

\frac{7}{- 4} by \frac{63}{64}

0 by \frac{- 7}{5}

\frac{- 3}{4} by - 6

\frac{2}{3} by \frac{- 7}{12}

- 4 by \frac{- 3}{5}

\frac{- 3}{13} by \frac{- 4}{65}

Q. Carry out the following multipliclations:

(1) 12 × (−3)
(2) (−6) × 4
(3) (−15) × (−5)
(4) 35 × 8
(5) (−38) × (−2)
(6) 15 × (−61)

Q. Study the pattern and write next step:

24 \times 5 = 120 \times 1

24 \times 15 = 120 \times 3

24 \times 25 = 120 \times 5

24 \times 35 = 120 \times 7

Q. The marks obtained by

20

students in maths are

35, 40, 78, 30, 50, 78, 36, 65, 78, 40, 30, 65, 50, 35, 80, 95, 80, 36, 95, 35

. Find the Arithmetic mean of the students by direct method.

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