exam Maths Puzzle Numerical Ability

how do you do, After 5 tests, a student’s average was 80. After taking an examination which
counted as two test grades, his average dropped to 76. What was his grade on that
examination?

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exam Other Question

i NEED HELP ON HOW TO FIND ANTILOGARITHMS USING INTERPOLATION AND THE LOGARITHMIC TABLE. AN EXAMPLE IS THIS

ANTILOG(8.2010-10)
THANKS ALOT!
Sonia
A 17 foot ladder leans against a building and reaches a height of 14 feet on the building. The bottom of the ladder is how far away from the bottom of the building?