The cost of five balloons is Rs. 400, then the cost of 8 balloons will be ______?
- Rs. 840
- Rs. 740
- Rs. 640
- None of these
Explanation
Cost of 5 balloons = Rs. 400
Cost of 1 balloon = 400/5 = Rs. 80
Cost of 8 balloons = 8 × 80 = Rs. 640
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