Q.7 Find answers to the following. Write and indicate how you solved them.
(a) Is \(\frac{5}{9} \) equal to \(\frac{4}{5} \)
(b) Is \(\frac{9}{16} \) equal to \(\frac{5}{9} \)
(c) Is \(\frac{4}{5} \) equal to \(\frac{16}{20} \)
(d) Is \(\frac{1}{15} \) equal to \(\frac{4}{30} \)


Answer :

(a) Is \(\frac{5}{9} \) equal to \(\frac{4}{5} \)
by cross multiplication
5 × 5 \(\square \) 9 × 4
25 \(\neq \) 36
\(\frac{5}{9} \) \(\neq \) \(\frac{4}{5} \)
(b) Is \(\frac{9}{16} \) equal to \(\frac{5}{9} \)
by cross multiplication
9 × 9 \(\square \) 16 × 5
81 \(\neq \) 80
\(\frac{9}{16} \) \(\neq \) \(\frac{5}{9} \)
(c) Is \(\frac{4}{5} \) equal to \(\frac{16}{20} \)
by cross multiplication
20 × 4 \(\square \) 16 × 5
80 = 80
\(\frac{4}{5} \) \(\neq \) \(\frac{16}{20} \)
(d) Is \(\frac{1}{15} \) equal to \(\frac{4}{30} \)
by cross multiplication
30 × 1 \(\square \) 4 × 15
30 \(\neq \) 60
\(\frac{1}{15} \) \(\neq \) \(\frac{4}{30} \)

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