exam Maths Puzzle Numerical Ability

2/5m=3
4/5=m=6

what was done to the first equation to get the second one?

2x=10
2x+4=14

what was done to the first equation to get the second one?

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Question

a) Given PRS and PQR are triangles. QR = 30 cm. Find PS.
b) PTQ, PMR and PMS are all triangles. PS = QR while PQ = RS. PQ = 24 cm while RS = 24 cm. Find PT.


Please help to solve this question. Thank you.
1.find perimeter of a square with diagonal of 12 centimeters
2.find the diagonal of a square with a perimeter of 20 inches
3.find the diagonal of a square with a perimeter of 28 inches