The answer is not 40! Can you figure out easy-looking math sum in 30 seconds by remembering the special rule?
The answer to this mathematical brain teaser is NOT 40 - can YOU solve it in 30 seconds by remembering the special rule?
Kanye West and daughter North, 12, perform surprise duet during Mexico concert
Kanye West and his daughter North gave a surprise duet performance during his Mexico City concert on Friday.
Getting a helping hand to remain independent with dementia - and what to look for when choosing a care home
Ensuring there's access to support can be crucial for the person with dementia - and the people caring for them, says Victoria Lyons, a specialist dementia nurse at Dementia UK.
Learning new skills can help to slow cognitive decline and stave off dementia
After a diagnosis, it's important to address the known risk factors, as these can make the disease worse, says Adam Greenstein, a professor of medicine at the University of Manchester.
How to get the best care and live well with a dementia diagnosis - the drugs and therapies that can ease symptoms
Every three minutes, someone in the UK is diagnosed with dementia. It is not an easy diagnosis to receive for the patient or their loved ones.
Angela Rayner secures £1million war chest to kick out Keir as former deputy PM's allies say she's 'ready to go' for leadership
Amid growing expectations that Sir Keir will soon face a challenge to his leadership, the former deputy prime minister has moved her stealth operation up a gear.
Lily Allen planning SECOND revenge album - and this time she'll shame record execs who abused her
In her latest album, Lily Allen sought revenge on her ex-husband David Harbour in the most brutal of ways after accusing him of cheating on her.
TALK OF THE TOWN: Is Brooklyn Beckham's holiday spot hinting at a Prince Harry-style bombshell biography?
While the Beckham family feud raged on last week, son Brooklyn projected a carefree image by posting images of himself sharing a relaxing break with wife Nicola Peltz.
Driverless taxi that jumped red light... but did it actually do the correct thing and prevent a busy junction snarl-up?
Dashcam footage shows one of London's first driverless taxis running a red light as it drove the tech firm's boss to Buckingham Palace to receive a gong for services to artificial intelligence.
MAIL ON SUNDAY COMMENT: PM saw off Burnham - but his problems are only just beginning
As Sir Keir Starmer returns to Britain from his 'kowtow' trip to China, an old Chinese curse comes to mind: may you live in interesting times.
How private clinic fed the £1,000-a-month cannabis addiction that drove my brilliant brother to suicide
After just one video consultation with a private cannabis clinic, Oliver Robinson became hooked, triggering an 18-month downward spiral which ended in his death.
Rita Ora opens up about her personal struggles with body image and how therapy has helped her
Rita Ora has opened up about her personal struggles with body image, revealing that therapy has helped her navigate insecurities around her appearance.
Lily Collins shares heartfelt tribute to music legend father Phil on his 'monumental' 75th birthday - after he opened up about his health woes
The Emily In Paris star, 36, took to Instagram with a rare snap of the pair marking the milestone, as well as a throwback of the hitmaker carrying her as a child.
Comedian Frank Skinner breaks down in tears after surprise reunion on Michael McIntyre's Big Show
Filmed at the prestigious Theatre Royal Drury Lane in London, Michael McIntyre's Big Show returned to screens on Saturday night.
Bond beauty Maryam d'Abo rules out cosmetic surgery and says she's content to age gracefully as she returns to the London stage
The actress, who is returning to the spotlight for a turn on the London stage later in February, says she has ruled out the cosmetic surgery which has become so popular among her peers.
Holly Ramsay showcases her abs in a crop top on sunrise hike before supporting husband Adam Peaty at the pool on their honeymoon in Australia
The daughter of Gordon Ramsay, 26, and Olympic swimmer, 31, soaked up the sun in Queensland after beginning their trip at a luxurious £6,000-a-night resort in Mauritius.
Calls for Met to reopen probe into Andrew Mountbatten-Windsor after documents 'link him to three more Epstein victims'
A bombshell disclosure from the vast Epstein Files this weekend included shocking pictures of the former Duke of York on his knees and crouching over a woman lying on the floor.
Love nest upgrade! Brad Pitt gives his $12million LA mansion a palm tree paradise makeover for live-in girlfriend Ines de Ramon
New Daily Mail photos show Pitt has transformed the grounds of the Hollywood Hills home he now shares with girlfriend, Ines de Ramon - swapping out traditional landscaping for rows of palm trees.
Brits could be forced to pay licence fee to use BBC website and radio under controversial plans to fund Corporation
The corporation is currently looking at alternative ways to fund its operations amid a fall in the number of people paying the fee each year.
Ex-terrorist who praised jihad as a 'compassionate act' set to be UK councillor
Shahid Butt - who will be an independent candidate in Birmingham in May's local elections- has also told Muslims 'not to take Jews and Christians as friends' in an interview.