exam Maths Puzzle Numerical Ability

The ratio of Brand "Y" golf balls sold to Brand "X" golf balls sold was 4 to 5. If there were 22 fewer Brand "Y" golf ablls than Brand "X" golf balls, then how many Brand "X" golf balls were sold?

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exam Other Question

draw a diagram to show each of the following functions
a-multiply by 4-add5
Please help me. I am having problem with this question.

1. If the diameter of a circle is 1.3 * (10)^-12 meters, then wha is the radius?

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