exam Maths Puzzle Numerical Ability

A Chemist ahs 25% and a 50% acid soultion. How much of each soultion should be used to form 200 ml of a 35% acid soultion.

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exam Other Question

Determine x for 102x + 1 = 100 x.
a. x = -1
b. x = 2
c. x = 0
d. No solution The sum of two numbers is 90. The larger number is 9 less than 3 times the smaller number. Find the smaller number.