book Maths Puzzle Numerical Ability

A father is 4 time as old as his son. 5 years ago the sum of their ages was 70 find their present age.

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GIVEN THE FOLLOWING INFORMATION, DETERMINE WHICH LINES, IF ANY, ARE PARALLEL. STATE THE POSTULATE OR THEOREM THAT JUSTIFIES YOUR ANSWER. a car stereo system thet regularly sells for $425 is on sale for $318.75. find the discount rate.