## Triangular matrix

If U1, U2 are upper triangular and L1, L2 are lower triangular, which of the following are triangular? U1 + U2 U1U2 U12 U1 + L1 U1L1 L1 +...

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## The sunrise problem

Two women start walking at the sunrise, one from point A to B and another from point B to A. The pass each other exactly at noon. The first...

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## calculate angle X

The two straight lines CD and AB are parallel to each OAB = 60 OCD = 110 Angle X.

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## Age problem-2

One number is 3 times another number. If the larger number is diminished by 8, the resultant is 7 more than twice the smaller number. Find the numbers.

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## Statistics-Mean

In computing a mean of 8 numbers, a boy mistakenly used 17 instead of 25 as one of the numbers and obtained 20 as mean. Find the correct ...

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## Lengths of sides of triangles

Calculate the length of the sides opposite to the given angle in triangle ABC. B = degBC = 5 cm AB = 8 cm

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