exam Maths Puzzle Numerical Ability

Complete the ordered pairs for the equation y=5x+15. Please show me how you arrived at the answer.

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exam Other Question

A buyer has spent Rs.30,151 on 550 units of a particular item.The first 100 units cost Rs.50 each;the next 150 units cost Rs.8,250 in total.The next batch cost Rs.11,200 in total and the final 100 cost Rs.x each.Find the value of x. When a rock is dropped from a cliff into an ocean, it travels approximately 16t squared feet in t seconds. If the splash is heard 4 seconds later and the speed of sound is 1100 ft/sec, approximate the height of the cliff.