exam Maths Puzzle Numerical Ability

Evaluate. (-1)(-1) - 25

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exam Other Question

one recipe calls for 1/4 teaspoon vanilla. A second recipe requires for 1/2 teaspoon vanilla flour, and a third recipe calls for 1/8 teaspoon vanilla. How much vanilla is required to make all three recipes? a girl is 2/3 older than her sister. In 6 years, she will be 4/5 older and in 15 years it will be 7/8. Both girls are under 10 years old. what are their ages?