Discussion

Explanation:

Let the required cost be Rs. x. Then,

Cost ∝ No. of toys

(When 2 quantities are directly proportional, their ratio is constant)

⇒ $\frac{25}{35}=\frac{390}{x}$ 

⇒ (25 × x) = (35 × 390) 

⇒ x = (35 × 390)/25 = 546

∴ the cost of 35 toys is Rs. 546.

Hence, 546.

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