Question

Please answer this question as fast as you can and please explain :-
1) Today my 3 cousins multiplied their ages together and it came to 2016. This day last year their ages multiplied to 1377. When they multiplied their ages 2 years ago today, what was their answer?
2) You have an unlimited supply of five different coloured pop-sticks and want to make as many different coloured equilateral triangles as possible, using three sticks.
Two triangles are not considered different if there are rotations or reflections of each other. How many triangles are possible?
3) A tuckshop has two jars of cordial mixture.
Jar A is 30% cordial and Jar B is 60% cordial.
Some of Jar A is mixed with some of Jar B to make 18 litres of 50% cordial.
How many litres from Jar A is used?
4) George has a new lock that opens if the four numbers 1,2,3 and 4 are pressed once each in the correct order. If the first number must be larger than the second number, how many

Answer 1

For number 3
By using guess and check method

50% -> 18L = 900

So from the choices choose which is the suitable answer while the total of liter must be 18 ex.. If a is 5L so the b must 13L later times it with the percentage to find which one is 900

So the answer

A 30% x 6L = 180
B 60% x 12L = 720
Total is 900