If the cost of 5 dolls or 6 balls is Rs. 15, then find the cost of 10 dolls and 18 balls.
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If the cost of 5 dolls or 6 balls is Rs.15, then find the cost of 10 dolls and 18 balls.

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Solution —

∵ 5 dolls = 6 balls

∴ 1 dolls = 6 / 5 balls

∴ 10 dolls = 6/5 ×10 = 12 balls

∴ 10 dolls + 18 balls = 12 balls + 18 balls

                                  = 30 balls

∴ The cost of 6 balls = Rs 15

∴ The cost of 1 ball = Rs 15 / 6

∴ The cost of 30 balls = Rs.15 / 6 × 30

                                    = Rs. 75

Thus, Cost of 10 dolls and 18 balls = Rs.75

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